X-Git-Url: http://git.kpe.io/?p=ctsim.git;a=blobdiff_plain;f=libctsim%2Fimagefile.cpp;h=0cbd67826ae194750b64cb8df9a70f3dbbdaeeac;hp=b86ff794ae9cd0242201c21e33184bca9c513e3f;hb=9b2bb510160bdb56f04847f5b55ab61dd8a47976;hpb=f7d2b7144f32a7bd157b7689022e62944b82fcc1

diff --git a/libctsim/imagefile.cpp b/libctsim/imagefile.cpp
index b86ff79..0cbd678 100644
--- a/libctsim/imagefile.cpp
+++ b/libctsim/imagefile.cpp
@@ -9,7 +9,7 @@
 **  This is part of the CTSim program
 **  Copyright (C) 1983-2000 Kevin Rosenberg
 **
-**  $Id: imagefile.cpp,v 1.23 2000/12/21 03:40:58 kevin Exp $
+**  $Id: imagefile.cpp,v 1.29 2001/01/02 05:34:57 kevin Exp $
 **
 **  This program is free software; you can redistribute it and/or modify
 **  it under the terms of the GNU General Public License (version 2) as
@@ -27,98 +27,149 @@
 
 #include "ct.h"
 
+const int ImageFile::FORMAT_INVALID = -1;
+const int ImageFile::FORMAT_PGM = 0;
+const int ImageFile::FORMAT_PGMASCII = 1;
+#ifdef HAVE_PNG
+const int ImageFile::FORMAT_PNG = 2;
+const int ImageFile::FORMAT_PNG16 = 3;
+#endif
+
+const char* ImageFile::s_aszFormatName[] = 
+{
+  {"pgm"},
+  {"pgmascii"},
+#ifdef HAVE_PNG
+  {"png"},
+  {"png16"},
+#endif
+};
+
+const char* ImageFile::s_aszFormatTitle[] = 
+{
+  {"PGM"},
+  {"PGM ASCII"},
+  {"PNG"},
+  {"PNG 16-bit"},
+};
+
+const int ImageFile::s_iFormatCount = sizeof(s_aszFormatName) / sizeof(const char*);
+
+
 
-F32Image::F32Image (int nx, int ny)
-: Array2dFile (nx, ny, sizeof(kfloat32), Array2dFile::PIXEL_FLOAT32)
+F32Image::F32Image (int nx, int ny, int dataType)
+: Array2dFile (nx, ny, sizeof(kfloat32), Array2dFile::PIXEL_FLOAT32, dataType)
 {
 }
 
 F32Image::F32Image (void)
 : Array2dFile()
 {
-	setPixelFormat (Array2dFile::PIXEL_FLOAT32);
-	setPixelSize (sizeof(kfloat32));
+  setPixelFormat (Array2dFile::PIXEL_FLOAT32);
+  setPixelSize (sizeof(kfloat32));
+  setDataType (Array2dFile::DATA_TYPE_REAL);
 }
 
-F64Image::F64Image (int nx, int ny)
-: Array2dFile (nx, ny, sizeof(kfloat64), Array2dFile::PIXEL_FLOAT64)
+F64Image::F64Image (int nx, int ny, int dataType)
+: Array2dFile (nx, ny, sizeof(kfloat64), Array2dFile::PIXEL_FLOAT64, dataType)
 {
 }
 
 F64Image::F64Image (void)
 : Array2dFile ()
 {
-	setPixelFormat (PIXEL_FLOAT64);
-	setPixelSize (sizeof(kfloat64));
+  setPixelFormat (PIXEL_FLOAT64);
+  setPixelSize (sizeof(kfloat64));
+  setDataType (Array2dFile::DATA_TYPE_REAL);
 }
 
 void 
-ImageFile::filterResponse (const char* const domainName, double bw, const char* const filterName, double filt_param)
-{
-	int hx = (m_nx - 1) / 2;
-	int hy = (m_ny - 1) / 2;
-	ImageFileArray v = getArray();
-	SignalFilter filter (filterName, domainName, bw, filt_param);
-	
-	for (int i = -hx; i <= hx; i++) {
-		for (int j = -hy; j <= hy; j++) {
-			double r = sqrt (i * i + j * j);
-			
-			v[i+hx][j+hy] = filter.response (r);
-		}
-	}
+ImageFile::filterResponse (const char* const domainName, double bw, const char* const filterName, double filt_param, double dInputScale, double dOutputScale)
+{
+  ImageFileArray v = getArray();
+  SignalFilter filter (filterName, domainName, bw, filt_param);
+
+#if 1
+  int iXCenter, iYCenter;
+  if (isEven (m_nx))
+    iXCenter = m_nx / 2;
+  else
+    iXCenter = (m_nx - 1) / 2;
+  if (isEven (m_ny))
+    iYCenter = m_ny / 2;
+  else
+    iYCenter = (m_ny - 1) / 2;
+
+  for (int ix = 0; ix < m_nx; ix++)
+    for (int iy = 0; iy < m_ny; iy++) {
+      long lD2 = ((ix - iXCenter) * (ix - iXCenter)) + ((iy - iYCenter) * (iy - iYCenter));
+      double r = ::sqrt (static_cast<double>(lD2)) * dInputScale;
+      v[ix][iy] = filter.response (r) * dOutputScale;
+    }
+#else
+  int hx = (m_nx - 1) / 2;
+  int hy = (m_ny - 1) / 2;
+  
+  for (int i = -hx; i <= hx; i++) {
+    for (int j = -hy; j <= hy; j++) {
+      double r = ::sqrt (i * i + j * j);
+      
+      v[i+hx][j+hy] = filter.response (r);
+    }
+  }
+#endif
 }
 
 int
 ImageFile::display (void) const
 {
-    double pmin, pmax;
-	
-    getMinMax (pmin, pmax);
-	
-    return (displayScaling (1, pmin, pmax));
+  double pmin, pmax;
+  
+  getMinMax (pmin, pmax);
+  
+  return (displayScaling (1, pmin, pmax));
 }
 
 int 
 ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const ImageFileValue pmax) const
 {
-    int nx = m_nx;
-    int ny = m_ny;
-    ImageFileArrayConst v = getArray();
-    if (v == NULL || nx == 0 || ny == 0)
-		return 0;
-	
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArrayConst v = getArray();
+  if (v == NULL || nx == 0 || ny == 0)
+    return 0;
+  
 #if HAVE_G2_H
-    int* pPens = new int [nx * ny * scale * scale ];
-	
-    double view_scale = 255 / (pmax - pmin);
-    int id_X11 = g2_open_X11 (nx * scale, ny * scale);
-    int grayscale[256];
-    for (int i = 0; i < 256; i++) {
-		double cval = i / 255.;
-		grayscale[i] = g2_ink (id_X11, cval, cval, cval);
-    }
-	
-    for (int iy = ny - 1; iy >= 0; iy--) {
-		int iRowPos = ((ny - 1 - iy) * scale) * (nx * scale);
-		for (int ix = 0; ix < nx; ix++) {
-			int cval = static_cast<int>((v[ix][iy] - pmin) * view_scale);
-			if (cval < 0)  
-				cval = 0;
-			else if (cval > 255) 
-				cval = 255;
-			for (int sy = 0; sy < scale; sy++)
-				for (int sx = 0; sx < scale; sx++)
-					pPens[iRowPos+(sy * nx * scale)+(sx + (ix * scale))] = grayscale[cval];
-		}
+  int* pPens = new int [nx * ny * scale * scale ];
+  
+  double view_scale = 255 / (pmax - pmin);
+  int id_X11 = g2_open_X11 (nx * scale, ny * scale);
+  int grayscale[256];
+  for (int i = 0; i < 256; i++) {
+    double cval = i / 255.;
+    grayscale[i] = g2_ink (id_X11, cval, cval, cval);
+  }
+  
+  for (int iy = ny - 1; iy >= 0; iy--) {
+    int iRowPos = ((ny - 1 - iy) * scale) * (nx * scale);
+    for (int ix = 0; ix < nx; ix++) {
+      int cval = static_cast<int>((v[ix][iy] - pmin) * view_scale);
+      if (cval < 0)  
+        cval = 0;
+      else if (cval > 255) 
+        cval = 255;
+      for (int sy = 0; sy < scale; sy++)
+        for (int sx = 0; sx < scale; sx++)
+          pPens[iRowPos+(sy * nx * scale)+(sx + (ix * scale))] = grayscale[cval];
     }
-	
-    g2_image (id_X11, 0., 0., nx * scale, ny * scale, pPens);
-	
-    delete pPens;
-    return (id_X11);
+  }
+  
+  g2_image (id_X11, 0., 0., nx * scale, ny * scale, pPens);
+  
+  delete pPens;
+  return (id_X11);
 #else
-    return 0;
+  return 0;
 #endif
 }
 
@@ -137,277 +188,1076 @@ ImageFile::displayScaling (const int scale, const ImageFileValue pmin, const Ima
 bool
 ImageFile::comparativeStatistics (const ImageFile& imComp, double& d, double& r, double& e) const
 {
-    if (imComp.nx() != m_nx && imComp.ny() != m_ny) {
-		sys_error (ERR_WARNING, "Image sizes differ [ImageFile::comparativeStatistics]");
-		return false;
-    }
-    ImageFileArrayConst v = getArray();
-    if (v == NULL || m_nx == 0 || m_ny == 0)
-		return false;
-	
-    ImageFileArrayConst vComp = imComp.getArray();
-	
-    double myMean = 0.;
-    for (unsigned int ix = 0; ix < m_nx; ix++) {
-		for (unsigned int iy = 0; iy < m_ny; iy++) {
-			myMean += v[ix][iy];
-		}
+  if (imComp.nx() != m_nx && imComp.ny() != m_ny) {
+    sys_error (ERR_WARNING, "Image sizes differ [ImageFile::comparativeStatistics]");
+    return false;
+  }
+  ImageFileArrayConst v = getArray();
+  if (v == NULL || m_nx == 0 || m_ny == 0)
+    return false;
+  
+  ImageFileArrayConst vComp = imComp.getArray();
+  
+  double myMean = 0.;
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      myMean += v[ix][iy];
     }
-    myMean /= (m_nx * m_ny);
-	
-    double sqErrorSum = 0.;
-    double absErrorSum = 0.;
-    double sqDiffFromMeanSum = 0.;
-    double absValueSum = 0.;
-    for (unsigned int ix2 = 0; ix2 < m_nx; ix2++) {
-		for (unsigned int iy = 0; iy < m_ny; iy++) {
-			double diff = v[ix2][iy] - vComp[ix2][iy];
-			sqErrorSum += diff * diff;
-			absErrorSum += fabs(diff);
-			double diffFromMean = v[ix2][iy] - myMean;
-			sqDiffFromMeanSum += diffFromMean * diffFromMean;
-			absValueSum += fabs(v[ix2][iy]);
-		}
+  }
+  myMean /= (m_nx * m_ny);
+  
+  double sqErrorSum = 0.;
+  double absErrorSum = 0.;
+  double sqDiffFromMeanSum = 0.;
+  double absValueSum = 0.;
+  for (unsigned int ix2 = 0; ix2 < m_nx; ix2++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      double diff = v[ix2][iy] - vComp[ix2][iy];
+      sqErrorSum += diff * diff;
+      absErrorSum += fabs(diff);
+      double diffFromMean = v[ix2][iy] - myMean;
+      sqDiffFromMeanSum += diffFromMean * diffFromMean;
+      absValueSum += fabs(v[ix2][iy]);
     }
-	
-    d = sqrt (sqErrorSum / sqDiffFromMeanSum);
-    r = absErrorSum / absValueSum;
-	
-    int hx = m_nx / 2;
-    int hy = m_ny / 2;
-    double eMax = -1;
-    for (int ix3 = 0; ix3 < hx; ix3++) {
-		for (int iy = 0; iy < hy; iy++) {
-			double avgPixel = 0.25 * (v[2*ix3][2*iy] + v[2*ix3+1][2*iy] + v[2*ix3][2*iy+1] + v[2*ix3+1][2*iy+1]);
-			double avgPixelComp = 0.25 * (vComp[2*ix3][2*iy] + vComp[2*ix3+1][2*iy] + vComp[2*ix3][2*iy+1] + vComp[2*ix3+1][2*iy+1]);
-			double error = fabs (avgPixel - avgPixelComp);
-			if (error > eMax)
-				eMax = error;
-		}
+  }
+  
+  d = ::sqrt (sqErrorSum / sqDiffFromMeanSum);
+  r = absErrorSum / absValueSum;
+  
+  int hx = m_nx / 2;
+  int hy = m_ny / 2;
+  double eMax = -1;
+  for (int ix3 = 0; ix3 < hx; ix3++) {
+    for (int iy = 0; iy < hy; iy++) {
+      double avgPixel = 0.25 * (v[2*ix3][2*iy] + v[2*ix3+1][2*iy] + v[2*ix3][2*iy+1] + v[2*ix3+1][2*iy+1]);
+      double avgPixelComp = 0.25 * (vComp[2*ix3][2*iy] + vComp[2*ix3+1][2*iy] + vComp[2*ix3][2*iy+1] + vComp[2*ix3+1][2*iy+1]);
+      double error = fabs (avgPixel - avgPixelComp);
+      if (error > eMax)
+        eMax = error;
     }
-	
-    e = eMax;
-	
-    return true;
+  }
+  
+  e = eMax;
+  
+  return true;
 }
 
 
 bool
 ImageFile::printComparativeStatistics (const ImageFile& imComp, std::ostream& os) const
 {
-	double d, r, e;
-	
-	if (comparativeStatistics (imComp, d, r, e)) {
-		os << "  Normalized root mean squared distance (d): " << d << std::endl;
-		os << "      Normalized mean absolute distance (r): " << r << std::endl;
-		os << "Worst case distance (2x2 pixel average) (e): " << e << std::endl;
-		return true;
-	}
-	return false;
+  double d, r, e;
+  
+  if (comparativeStatistics (imComp, d, r, e)) {
+    os << "  Normalized root mean squared distance (d): " << d << std::endl;
+    os << "      Normalized mean absolute distance (r): " << r << std::endl;
+    os << "Worst case distance (2x2 pixel average) (e): " << e << std::endl;
+    return true;
+  }
+  return false;
 }
 
 
 void
 ImageFile::printStatistics (std::ostream& os) const
 {
-    double min, max, mean, mode, median, stddev;
-	
-    statistics (min, max, mean, mode, median, stddev);
-	
-    os << "   min: " << min << std::endl;
-    os << "   max: " << max << std::endl;
-    os << "  mean: " << mean << std::endl;
-    os << "  mode: " << mode << std::endl;
-    os << "median: " << median << std::endl;
-    os << "stddev: " << stddev << std::endl;
+  double min, max, mean, mode, median, stddev;
+  
+  statistics (min, max, mean, mode, median, stddev);
+  if (isComplex())
+    os << "Real Component Statistics" << std::endl;
+  
+  os << "   min: " << min << std::endl;
+  os << "   max: " << max << std::endl;
+  os << "  mean: " << mean << std::endl;
+  os << "  mode: " << mode << std::endl;
+  os << "median: " << median << std::endl;
+  os << "stddev: " << stddev << std::endl;
+  
+  if (isComplex()) {
+    statistics (getImaginaryArray(), min, max, mean, mode, median, stddev);
+    os << std::endl << "Imaginary Component Statistics" << std::endl;
+    os << "   min: " << min << std::endl;
+    os << "   max: " << max << std::endl;
+    os << "  mean: " << mean << std::endl;
+    os << "  mode: " << mode << std::endl;
+    os << "median: " << median << std::endl;
+    os << "stddev: " << stddev << std::endl;
+  }
 }
 
 
 void
 ImageFile::statistics (double& min, double& max, double& mean, double& mode, double& median, double& stddev) const
-{
-    int nx = m_nx;
-    int ny = m_ny;
-    ImageFileArrayConst v = getArray();
-    
-    if (v == NULL || nx == 0 || ny == 0)
-		return;
-
-	std::vector<double> vecImage;
-	int iVec = 0;
-	vecImage.resize (nx * ny);
-    for (int ix = 0; ix < nx; ix++) {
-		for (int iy = 0; iy < ny; iy++)
-			vecImage[iVec++] = v[ix][iy];
-	}
-
-	vectorNumericStatistics (vecImage, nx * ny, min, max, mean, mode, median, stddev);
+{
+  ImageFileArrayConst v = getArray();
+  statistics (v, min, max, mean, mode, median, stddev);
 }
 
 
+void
+ImageFile::statistics (ImageFileArrayConst v, double& min, double& max, double& mean, double& mode, double& median, double& stddev) const
+{
+  int nx = m_nx;
+  int ny = m_ny;
+  
+  if (v == NULL || nx == 0 || ny == 0)
+    return;
+  
+  std::vector<double> vecImage;
+  int iVec = 0;
+  vecImage.resize (nx * ny);
+  for (int ix = 0; ix < nx; ix++) {
+    for (int iy = 0; iy < ny; iy++)
+      vecImage[iVec++] = v[ix][iy];
+  }
+  
+  vectorNumericStatistics (vecImage, nx * ny, min, max, mean, mode, median, stddev);
+}
+
 void
 ImageFile::getMinMax (double& min, double& max) const
 {
-    int nx = m_nx;
-    int ny = m_ny;
-    ImageFileArrayConst v = getArray();
-    
-    if (v == NULL || nx == 0 || ny == 0)
-		return;
-	
-    min = v[0][0];
-    max = v[0][0];
-    for (int ix = 0; ix < nx; ix++) {
-		for (int iy = 0; iy < ny; iy++) {
-			if (v[ix][iy] > max)
-				max = v[ix][iy];
-			if (v[ix][iy] < min)
-				min = v[ix][iy];
-		}
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArrayConst v = getArray();
+  
+  if (v == NULL || nx == 0 || ny == 0)
+    return;
+  
+  min = v[0][0];
+  max = v[0][0];
+  for (int ix = 0; ix < nx; ix++) {
+    for (int iy = 0; iy < ny; iy++) {
+      if (v[ix][iy] > max)
+        max = v[ix][iy];
+      if (v[ix][iy] < min)
+        min = v[ix][iy];
     }
+  }
 }
+
+bool
+ImageFile::convertRealToComplex ()
+{
+  if (dataType() != Array2dFile::DATA_TYPE_REAL)
+    return false;
+  
+  if (! reallocRealToComplex())
+    return false;
+  
+  ImageFileArray vImag = getImaginaryArray();
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    ImageFileColumn vCol = vImag[ix];
+    for (unsigned int iy = 0; iy < m_ny; iy++)
+      *vCol++ = 0;
+  }
+  
+  return true;
+}
+
+bool
+ImageFile::convertComplexToReal ()
+{
+  if (dataType() != Array2dFile::DATA_TYPE_COMPLEX)
+    return false;
+  
+  ImageFileArray vReal = getArray();
+  ImageFileArray vImag = getImaginaryArray();
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    ImageFileColumn vRealCol = vReal[ix];
+    ImageFileColumn vImagCol = vImag[ix];
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      CTSimComplex c (*vRealCol, *vImagCol);
+      *vRealCol++ = std::abs (c);
+      vImagCol++;
+    }
+  }
+  
+  return reallocComplexToReal();
+}
+
+bool
+ImageFile::subtractImages (const ImageFile& rRHS, ImageFile& result) const
+{
+  if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
+    return false;
+  }
+  
+  if (isComplex() || rRHS.isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArrayConst vRHS = rRHS.getArray();
+  ImageFileArrayConst vRHSImag = rRHS.getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      vResult[ix][iy] = vLHS[ix][iy] - vRHS[ix][iy];
+      if (result.isComplex()) {
+        vResultImag[ix][iy] = 0;
+        if (isComplex())
+          vResultImag[ix][iy] += vLHSImag[ix][iy];
+        if (rRHS.isComplex())
+          vResultImag[ix][iy] -= vRHSImag[ix][iy];
+      }
+    }
+  }
+    
+  return true;
+}
 
-void 
-ImageFile::writeImagePGM (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
+bool
+ImageFile::addImages (const ImageFile& rRHS, ImageFile& result) const
+{
+  if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
+    return false;
+  }
+  
+  if (isComplex() || rRHS.isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArrayConst vRHS = rRHS.getArray();
+  ImageFileArrayConst vRHSImag = rRHS.getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      vResult[ix][iy] = vLHS[ix][iy] + vRHS[ix][iy];
+      if (result.isComplex()) {
+        vResultImag[ix][iy] = 0;
+        if (isComplex())
+          vResultImag[ix][iy] += vLHSImag[ix][iy];
+        if (rRHS.isComplex())
+          vResultImag[ix][iy] += vRHSImag[ix][iy];
+      }
+    }
+  }
+  
+  return true;
+}
+
+bool
+ImageFile::multiplyImages (const ImageFile& rRHS, ImageFile& result) const
+{
+  if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
+    return false;
+  }
+  
+  if (isComplex() || rRHS.isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArrayConst vRHS = rRHS.getArray();
+  ImageFileArrayConst vRHSImag = rRHS.getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cRHS (vRHS[ix][iy], 0);
+        if (rRHS.isComplex())
+          cRHS.imag (vRHSImag[ix][iy]);
+        std::complex<double> cResult = cLHS * cRHS;
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else
+        vResult[ix][iy] = vLHS[ix][iy] * vRHS[ix][iy];
+    }
+  }
+  
+  
+  return true;
+}
+
+bool
+ImageFile::divideImages (const ImageFile& rRHS, ImageFile& result) const
+{
+  if (m_nx != rRHS.nx() || m_ny != rRHS.ny() || m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::subtractImage]");
+    return false;
+  }
+  
+  if (isComplex() || rRHS.isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArrayConst vRHS = rRHS.getArray();
+  ImageFileArrayConst vRHSImag = rRHS.getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cRHS (vRHS[ix][iy], 0);
+        if (rRHS.isComplex())
+          cRHS.imag (vRHSImag[ix][iy]);
+        std::complex<double> cResult = cLHS / cRHS;
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else {
+        if (vRHS != 0)
+          vResult[ix][iy] = vLHS[ix][iy] / vRHS[ix][iy];
+        else
+          vResult[ix][iy] = 0;
+      }
+    }
+  }
+  
+  
+  return true;
+}
+
+
+bool
+ImageFile::invertPixelValues (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArray vResult = result.getArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    ImageFileColumnConst in = vLHS[ix];
+    ImageFileColumn out = vResult[ix];
+    for (unsigned int iy = 0; iy < m_ny; iy++)
+      *out++ = - *in++;
+  }
+  
+  return true;
+}
+
+bool
+ImageFile::sqrt (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+  
+  bool bComplexOutput = result.isComplex();
+  ImageFileArrayConst vLHS = getArray();
+  if (! bComplexOutput)   // check if should convert to complex output
+    for (unsigned int ix = 0; ix < m_nx; ix++)
+      for (unsigned int iy = 0; iy < m_ny; iy++)
+        if (! bComplexOutput && vLHS[ix][iy] < 0) {
+          result.convertRealToComplex();
+          bComplexOutput = true;
+          break;
+        }
+
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cResult = std::sqrt(cLHS);
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else
+        vResult[ix][iy] = ::sqrt (vLHS[ix][iy]);
+    }
+  }
+  
+  
+  return true;
+}
+
+bool
+ImageFile::log (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cResult = std::log (cLHS);
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else
+        vResult[ix][iy] = ::log (vLHS[ix][iy]);
+    }
+  }
+  
+  
+  return true;
+}
+
+bool
+ImageFile::exp (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+    
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cResult = std::exp (cLHS);
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else
+        vResult[ix][iy] = ::exp (vLHS[ix][iy]);
+    }
+  }
+  
+  
+  return true;
+}
+
+bool
+ImageFile::scaleImage (ImageFile& result) const
+{
+  unsigned int nx = m_nx;
+  unsigned int ny = m_ny;
+  unsigned int newNX = result.nx();
+  unsigned int newNY = result.ny();
+
+  double dXScale = static_cast<double>(newNX) / static_cast<double>(nx);
+  double dYScale = static_cast<double>(newNY) / static_cast<double>(ny);
+
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vReal = getArray();
+  ImageFileArrayConst vImag = getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < newNX; ix++) {
+    for (unsigned int iy = 0; iy < newNY; iy++) {
+      unsigned int scaleNX = static_cast<unsigned int> (ix / dXScale);
+      unsigned int scaleNY = static_cast<unsigned int> (iy / dYScale);
+      vResult[ix][iy] = vReal[scaleNX][scaleNY];
+      if (result.isComplex()) {
+        if (isComplex())
+          vResultImag[ix][iy] = vImag[scaleNX][scaleNY];
+        else
+        vResultImag[ix][iy] = 0;
+      }
+    }
+  }
+  
+  return true;
+}
+
+#ifdef HAVE_FFTW
+bool
+ImageFile::fft (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+
+  if (result.dataType() == Array2dFile::DATA_TYPE_REAL) {
+    if (! result.convertRealToComplex ())
+      return false;
+  }
+
+  fftw_complex* in = new fftw_complex [m_nx * m_ny];
+
+  ImageFileArrayConst vReal = getArray();
+  ImageFileArrayConst vImag = getImaginaryArray();
+
+  unsigned int ix, iy;
+  unsigned int iArray = 0;
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      in[iArray].re = vReal[ix][iy];
+      if (isComplex())
+        in[iArray].im = vImag[ix][iy];
+      else
+        in[iArray].im = 0;
+      iArray++;
+    }
+
+  fftwnd_plan plan = fftw2d_create_plan (m_nx, m_ny, FFTW_FORWARD, FFTW_IN_PLACE);
+
+  fftwnd_one (plan, in, NULL);
+
+  ImageFileArray vRealResult = result.getArray();
+  ImageFileArray vImagResult = result.getImaginaryArray();
+  iArray = 0;
+  unsigned int iScale = m_nx * m_ny;
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = in[iArray].re / iScale;
+      vImagResult[ix][iy] = in[iArray].im / iScale;
+      iArray++;
+    }
+
+  fftwnd_destroy_plan (plan);
+  delete in;
+
+
+  Fourier::shuffleFourierToNaturalOrder (result);
+
+  return true;
+}
+
+
+bool
+ImageFile::ifft (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+
+  if (result.dataType() == Array2dFile::DATA_TYPE_REAL) {
+    if (! result.convertRealToComplex ())
+      return false;
+  }
+
+  ImageFileArrayConst vReal = getArray();
+  ImageFileArrayConst vImag = getImaginaryArray();
+  ImageFileArray vRealResult = result.getArray();
+  ImageFileArray vImagResult = result.getImaginaryArray();
+  unsigned int ix, iy;
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = vReal[ix][iy];
+      if (isComplex()) 
+        vImagResult[ix][iy] = vImag[ix][iy];
+      else
+        vImagResult[ix][iy] = 0;
+    }
+
+  Fourier::shuffleNaturalToFourierOrder (result);
+
+  fftw_complex* in = new fftw_complex [m_nx * m_ny];
+
+  unsigned int iArray = 0;
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      in[iArray].re = vRealResult[ix][iy];
+      in[iArray].im = vImagResult[ix][iy];
+      iArray++;
+    }
+
+  fftwnd_plan plan = fftw2d_create_plan (m_nx, m_ny, FFTW_BACKWARD, FFTW_IN_PLACE);
+
+  fftwnd_one (plan, in, NULL);
+
+  iArray = 0;
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = in[iArray].re;
+      vImagResult[ix][iy] = in[iArray].im;
+      iArray++;
+    }
+
+  fftwnd_destroy_plan (plan);
+
+  delete in;
+
+  return true;
+}
+#endif // HAVE_FFTW
+
+
+  
+bool
+ImageFile::fourier (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  if (! result.isComplex())
+    if (! result.convertRealToComplex ())
+      return false;
+  
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vRealResult = result.getArray();
+  ImageFileArray vImagResult = result.getImaginaryArray();
+  
+  unsigned int ix, iy;
+
+  // alloc output matrix
+  CTSimComplex** complexOut = new CTSimComplex* [m_nx];
+  for (ix = 0; ix < m_nx; ix++)
+    complexOut[ix] = new CTSimComplex [m_ny];
+  
+  // fourier each x column
+#if 1
+  CTSimComplex* pY = new CTSimComplex [m_ny];
+  for (ix = 0; ix < m_nx; ix++) {
+    for (iy = 0; iy < m_ny; iy++) {
+      pY[iy].real (vLHS[ix][iy]);
+      if (isComplex())
+        pY[iy].imag (vLHSImag[ix][iy]);
+      else
+        pY[iy].imag (0);
+    } 
+    ProcessSignal::finiteFourierTransform (pY, complexOut[ix], m_ny,  ProcessSignal::FORWARD);
+  }
+#else
+  double* pY = new double [m_ny];
+  for (ix = 0; ix < m_nx; ix++) {
+    for (iy = 0; iy < m_ny; iy++) {
+      pY[iy] = vLHS[ix][iy];
+    } 
+    ProcessSignal::finiteFourierTransform (pY, complexOut[ix], m_ny,  ProcessSignal::FORWARD);
+  }
+#endif
+  delete [] pY;
+  
+  // fourier each y row
+  CTSimComplex* pX = new CTSimComplex [m_nx];
+  CTSimComplex* complexOutRow = new CTSimComplex [m_nx];
+  for (iy = 0; iy < m_ny; iy++) {
+    for (ix = 0; ix < m_nx; ix++)
+      pX[ix] = complexOut[ix][iy];
+    ProcessSignal::finiteFourierTransform (pX, complexOutRow, m_nx, ProcessSignal::FORWARD);
+    for (ix = 0; ix < m_nx; ix++)
+      complexOut[ix][iy] = complexOutRow[ix];
+  }
+  delete [] pX;
+  delete [] complexOutRow;
+
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = complexOut[ix][iy].real();
+      vImagResult[ix][iy] = complexOut[ix][iy].imag();
+    }
+    
+  Fourier::shuffleFourierToNaturalOrder (result);
+
+  // delete complexOut matrix
+  for (ix = 0; ix < m_nx; ix++)
+    delete [] complexOut[ix];
+  delete [] complexOut;
+    
+  return true;
+}
+
+bool
+ImageFile::inverseFourier (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  if (result.dataType() == Array2dFile::DATA_TYPE_REAL) {
+    if (! result.convertRealToComplex ())
+      return false;
+  }
+  
+  ImageFileArrayConst vLHSReal = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vRealResult = result.getArray();
+  ImageFileArray vImagResult = result.getImaginaryArray();
+  
+  unsigned int ix, iy;
+  // alloc 2d complex output matrix
+  CTSimComplex** complexOut = new CTSimComplex* [m_nx];
+  for (ix = 0; ix < m_nx; ix++)
+    complexOut[ix] = new CTSimComplex [m_ny];
+
+  // put input image into result
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = vLHSReal[ix][iy];
+      if (isComplex())
+        vImagResult[ix][iy] = vLHSImag[ix][iy];
+      else
+        vImagResult[ix][iy] = 0;
+    }
+
+  Fourier::shuffleNaturalToFourierOrder (result);
+
+  // ifourier each x column
+  CTSimComplex* pCol = new CTSimComplex [m_ny];
+  for (ix = 0; ix < m_nx; ix++) {
+    for (iy = 0; iy < m_ny; iy++) {
+      pCol[iy].real (vRealResult[ix][iy]);
+      pCol[iy].imag (vImagResult[ix][iy]);
+    }
+    ProcessSignal::finiteFourierTransform (pCol, complexOut[ix], m_ny,  ProcessSignal::BACKWARD);
+  }
+  delete [] pCol;
+
+  // ifourier each y row
+  CTSimComplex* complexInRow = new CTSimComplex [m_nx];
+  CTSimComplex* complexOutRow = new CTSimComplex [m_nx];
+  for (iy = 0; iy < m_ny; iy++) {
+    for (ix = 0; ix < m_nx; ix++)
+      complexInRow[ix] = complexOut[ix][iy];
+    ProcessSignal::finiteFourierTransform (complexInRow, complexOutRow, m_nx, ProcessSignal::BACKWARD);
+    for (ix = 0; ix < m_nx; ix++)
+      complexOut[ix][iy] = complexOutRow[ix];
+  }
+  delete [] complexInRow;
+  delete [] complexOutRow;
+
+  for (ix = 0; ix < m_nx; ix++)
+    for (iy = 0; iy < m_ny; iy++) {
+      vRealResult[ix][iy] = complexOut[ix][iy].real();
+      vImagResult[ix][iy] = complexOut[ix][iy].imag();
+    }
+    
+  // delete complexOut matrix
+  for (ix = 0; ix < m_nx; ix++)
+    delete [] complexOut[ix];
+  delete [] complexOut;
+    
+  return true;
+}
+
+
+bool
+ImageFile::magnitude (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  ImageFileArray vReal = getArray();
+  ImageFileArray vImag = getImaginaryArray();
+  ImageFileArray vRealResult = result.getArray();
+
+  for (unsigned int ix = 0; ix < m_nx; ix++)
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (isComplex()) 
+        vRealResult[ix][iy] = ::sqrt (vReal[ix][iy] * vReal[ix][iy] + vImag[ix][iy] * vImag[ix][iy]);
+      else
+        vRealResult[ix][iy] = vReal[ix][iy];
+    }
+
+  if (result.isComplex())
+    result.convertComplexToReal();
+  
+    return true;
+}
+
+bool
+ImageFile::phase (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  ImageFileArray vReal = getArray();
+  ImageFileArray vImag = getImaginaryArray();
+  ImageFileArray vRealResult = result.getArray();
+
+  for (unsigned int ix = 0; ix < m_nx; ix++)
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (isComplex())
+        vRealResult[ix][iy] = ::atan2 (vImag[ix][iy], vReal[ix][iy]);
+      else
+        vRealResult[ix][iy] = 0;
+    }
+    
+  if (result.isComplex())
+    result.convertComplexToReal();
+  
+  return true;
+}
+
+bool
+ImageFile::square (ImageFile& result) const
+{
+  if (m_nx != result.nx() || m_ny != result.ny()) {
+    sys_error (ERR_WARNING, "Difference sizes of images [ImageFile::invertPixelValues]");
+    return false;
+  }
+  
+  if (isComplex() && ! result.isComplex())
+    result.convertRealToComplex();
+
+  ImageFileArrayConst vLHS = getArray();
+  ImageFileArrayConst vLHSImag = getImaginaryArray();
+  ImageFileArray vResult = result.getArray();
+  ImageFileArray vResultImag = result.getImaginaryArray();
+  
+  for (unsigned int ix = 0; ix < m_nx; ix++) {
+    for (unsigned int iy = 0; iy < m_ny; iy++) {
+      if (result.isComplex()) {
+        std::complex<double> cLHS (vLHS[ix][iy], 0);
+        if (isComplex())
+          cLHS.imag (vLHSImag[ix][iy]);
+        std::complex<double> cResult = cLHS * cLHS;
+        vResult[ix][iy] = cResult.real();
+        vResultImag[ix][iy] = cResult.imag();
+      } else
+        vResult[ix][iy] = vLHS[ix][iy] * vLHS[ix][iy];
+    }
+  }
+  
+  
+  return true;
+}
+
+int
+ImageFile::convertFormatNameToID (const char* const formatName)
+{
+  int formatID = FORMAT_INVALID;
+
+  for (int i = 0; i < s_iFormatCount; i++)
+      if (strcasecmp (formatName, s_aszFormatName[i]) == 0) {
+	  formatID = i;
+	  break;
+      }
+
+  return (formatID);
+}
+
+const char*
+ImageFile::convertFormatIDToName (int formatID)
+{
+  static const char *formatName = "";
+
+  if (formatID >= 0 && formatID < s_iFormatCount)
+      return (s_aszFormatName[formatID]);
+
+  return (formatName);
+}
+
+const char*
+ImageFile::convertFormatIDToTitle (const int formatID)
+{
+  static const char *formatTitle = "";
+
+  if (formatID >= 0 && formatID < s_iFormatCount)
+      return (s_aszFormatTitle[formatID]);
+
+  return (formatTitle);
+}
+
+bool
+ImageFile::exportImage (const char* const pszFormat, const char* const pszFilename, int nxcell, int nycell, double densmin, double densmax)
+{
+  int iFormatID = convertFormatNameToID (pszFormat);
+  if (iFormatID == FORMAT_INVALID) {
+    sys_error (ERR_SEVERE, "Invalid format %s [ImageFile::exportImage]", pszFormat);
+    return false;
+  }
+
+  if (iFormatID == FORMAT_PGM)
+    return writeImagePGM (pszFilename, nxcell, nycell, densmin, densmax);
+  else if (iFormatID == FORMAT_PGMASCII)
+    return writeImagePGMASCII (pszFilename, nxcell, nycell, densmin, densmax);
+  else if (iFormatID == FORMAT_PNG)
+    return writeImagePNG (pszFilename, 8, nxcell, nycell, densmin, densmax);
+  else if (iFormatID == FORMAT_PNG16)
+    return writeImagePNG (pszFilename, 16, nxcell, nycell, densmin, densmax);
+
+  sys_error (ERR_SEVERE, "Invalid format %s [ImageFile::exportImage]", pszFormat);
+  return false;
+}
+
+bool
+ImageFile::writeImagePGM (const char* const outfile, int nxcell, int nycell, double densmin, double densmax)
 {
-	FILE *fp;
-	int nx = m_nx;
-	int ny = m_ny;
-	ImageFileArray v = getArray();
-	
-	unsigned char* rowp = new unsigned char [nx * nxcell];
-	
-	if ((fp = fopen (outfile, "wb")) == NULL)
-		return;
-	
-	fprintf(fp, "P5\n");
-	fprintf(fp, "%d %d\n", nx, ny);
-	fprintf(fp, "255\n");
-	
-	for (int irow = ny - 1; irow >= 0; irow--) {
-		for (int icol = 0; icol < nx; icol++) {
-			int pos = icol * nxcell;
-			double dens = (v[icol][irow] - densmin) / (densmax - densmin);
-			dens = clamp (dens, 0., 1.);
-			for (int p = pos; p < pos + nxcell; p++) {
-				rowp[p] = static_cast<unsigned int> (dens * 255.);
-			}
-		}
-		for (int ir = 0; ir < nycell; ir++) {
-			for (int ic = 0; ic < nx * nxcell; ic++) 
-				fputc( rowp[ic], fp );
-		}
-	}
-	
-	delete rowp;
-	fclose(fp);
+  FILE *fp;
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArray v = getArray();
+  
+  unsigned char* rowp = new unsigned char [nx * nxcell];
+  
+  if ((fp = fopen (outfile, "wb")) == NULL)
+    return false;
+  
+  fprintf(fp, "P5\n");
+  fprintf(fp, "%d %d\n", nx, ny);
+  fprintf(fp, "255\n");
+  
+  for (int irow = ny - 1; irow >= 0; irow--) {
+    for (int icol = 0; icol < nx; icol++) {
+      int pos = icol * nxcell;
+      double dens = (v[icol][irow] - densmin) / (densmax - densmin);
+      dens = clamp (dens, 0., 1.);
+      for (int p = pos; p < pos + nxcell; p++) {
+        rowp[p] = static_cast<unsigned int> (dens * 255.);
+      }
+    }
+    for (int ir = 0; ir < nycell; ir++) {
+      for (int ic = 0; ic < nx * nxcell; ic++) 
+        fputc( rowp[ic], fp );
+    }
+  }
+  
+  delete rowp;
+  fclose(fp);
+
+  return true;
 }
 
-void 
-ImageFile::writeImagePGMASCII (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
+bool
+ImageFile::writeImagePGMASCII (const char* const outfile, int nxcell, int nycell, double densmin, double densmax)
 {
-	FILE *fp;
-	int nx = m_nx;
-	int ny = m_ny;
-	ImageFileArray v = getArray();
-	
-	unsigned char* rowp = new unsigned char [nx * nxcell];
-	
-	if ((fp = fopen (outfile, "wb")) == NULL)
-		return;
-	
-	fprintf(fp, "P2\n");
-	fprintf(fp, "%d %d\n", nx, ny);
-	fprintf(fp, "255\n");
-	
-	for (int irow = ny - 1; irow >= 0; irow--) {
-		for (int icol = 0; icol < nx; icol++) {
-			int pos = icol * nxcell;
-			double dens = (v[icol][irow] - densmin) / (densmax - densmin);
-			dens = clamp (dens, 0., 1.);
-			for (int p = pos; p < pos + nxcell; p++) {
-				rowp[p] = static_cast<unsigned int> (dens * 255.);
-			}
-		}
-		for (int ir = 0; ir < nycell; ir++) {
-			for (int ic = 0; ic < nx * nxcell; ic++) 
-				fprintf(fp, "%d ", rowp[ic]);
-			fprintf(fp, "\n");
-		}
-	}
-	
-	delete rowp;
-	fclose(fp);
+  FILE *fp;
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArray v = getArray();
+  
+  unsigned char* rowp = new unsigned char [nx * nxcell];
+  
+  if ((fp = fopen (outfile, "wb")) == NULL)
+    return false;
+  
+  fprintf(fp, "P2\n");
+  fprintf(fp, "%d %d\n", nx, ny);
+  fprintf(fp, "255\n");
+  
+  for (int irow = ny - 1; irow >= 0; irow--) {
+    for (int icol = 0; icol < nx; icol++) {
+      int pos = icol * nxcell;
+      double dens = (v[icol][irow] - densmin) / (densmax - densmin);
+      dens = clamp (dens, 0., 1.);
+      for (int p = pos; p < pos + nxcell; p++) {
+        rowp[p] = static_cast<unsigned int> (dens * 255.);
+      }
+    }
+    for (int ir = 0; ir < nycell; ir++) {
+      for (int ic = 0; ic < nx * nxcell; ic++) 
+        fprintf(fp, "%d ", rowp[ic]);
+      fprintf(fp, "\n");
+    }
+  }
+  
+  delete rowp;
+  fclose(fp);
+
+  return true;
 }
 
 
 #ifdef HAVE_PNG
-void 
-ImageFile::writeImagePNG (const char *outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax)
+bool
+ImageFile::writeImagePNG (const char* const outfile, int bitdepth, int nxcell, int nycell, double densmin, double densmax)
 {
-	FILE *fp;
-	png_structp png_ptr;
-	png_infop info_ptr;
-	double max_out_level = (1 << bitdepth) - 1;
-	int nx = m_nx;
-	int ny = m_ny;
-	ImageFileArray v = getArray();
-	
-	unsigned char* rowp = new unsigned char [nx * nxcell * (bitdepth / 8)];
-	
-	if ((fp = fopen (outfile, "wb")) == NULL)
-		return;
-	
-	png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
-	if (! png_ptr)
-		return;
-	
-	info_ptr = png_create_info_struct(png_ptr);
-	if (! info_ptr) {
-		png_destroy_write_struct(&png_ptr, (png_infopp) NULL);
-		fclose(fp);
-		return;
-	}
-	
-	if (setjmp(png_ptr->jmpbuf)) {
-		png_destroy_write_struct(&png_ptr, &info_ptr);
-		fclose(fp);
-		return;
-	}
-	
-	png_init_io(png_ptr, fp);
-	
-	png_set_IHDR(png_ptr, info_ptr, nx * nxcell, ny * nycell, bitdepth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_DEFAULT);
-	
-	png_write_info(png_ptr, info_ptr);
-	for (int irow = ny - 1; irow >= 0; irow--) {
-		png_bytep row_pointer = rowp;
-		
-		for (int icol = 0; icol < nx; icol++) {
-			int pos = icol * nxcell;
-			double dens = (v[icol][irow] - densmin) / (densmax - densmin);
-			dens = clamp (dens, 0., 1.);
-			unsigned int outval = static_cast<unsigned int> (dens * max_out_level);
-			
-			for (int p = pos; p < pos + nxcell; p++) {
-				if (bitdepth == 8)
-					rowp[p] = outval;
-				else {
-					int rowpos = p * 2;
-					rowp[rowpos] = (outval >> 8) & 0xFF;
-					rowp[rowpos+1] = (outval & 0xFF);
-				}
-			}
-		}
-		for (int ir = 0; ir < nycell; ir++)
-			png_write_rows (png_ptr, &row_pointer, 1);
-	}
-	
-	png_write_end(png_ptr, info_ptr);
-	png_destroy_write_struct(&png_ptr, &info_ptr);
-	delete rowp;
-	
-	fclose(fp);
+  double max_out_level = (1 << bitdepth) - 1;
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArray v = getArray();
+  
+  unsigned char* rowp = new unsigned char [nx * nxcell * (bitdepth / 8)];
+  
+  FILE *fp = fopen (outfile, "wb");
+  if (! fp)
+    return false;
+  
+  png_structp png_ptr = png_create_write_struct (PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
+  if (! png_ptr)
+    return false;
+  
+  png_infop info_ptr = png_create_info_struct (png_ptr);
+  if (! info_ptr) {
+    png_destroy_write_struct (&png_ptr, (png_infopp) NULL);
+    fclose (fp);
+    return false;
+  }
+  
+  if (setjmp (png_ptr->jmpbuf)) {
+    png_destroy_write_struct (&png_ptr, &info_ptr);
+    fclose (fp);
+    return false;
+  }
+  
+  png_init_io(png_ptr, fp);
+  
+  png_set_IHDR (png_ptr, info_ptr, nx * nxcell, ny * nycell, bitdepth, PNG_COLOR_TYPE_GRAY, PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_BASE, PNG_FILTER_TYPE_DEFAULT);
+  
+  png_write_info(png_ptr, info_ptr);
+  for (int irow = ny - 1; irow >= 0; irow--) {
+    png_bytep row_pointer = rowp;
+    
+    for (int icol = 0; icol < nx; icol++) {
+      int pos = icol * nxcell;
+      double dens = (v[icol][irow] - densmin) / (densmax - densmin);
+      dens = clamp (dens, 0., 1.);
+      unsigned int outval = static_cast<unsigned int> (dens * max_out_level);
+      
+      for (int p = pos; p < pos + nxcell; p++) {
+        if (bitdepth == 8)
+          rowp[p] = outval;
+        else {
+          int rowpos = p * 2;
+          rowp[rowpos] = (outval >> 8) & 0xFF;
+          rowp[rowpos+1] = (outval & 0xFF);
+        }
+      }
+    }
+    for (int ir = 0; ir < nycell; ir++)
+      png_write_rows (png_ptr, &row_pointer, 1);
+  }
+  
+  png_write_end (png_ptr, info_ptr);
+  png_destroy_write_struct (&png_ptr, &info_ptr);
+  delete rowp;
+  
+  fclose(fp);
+
+  return true;
 }
 #endif
 
@@ -415,47 +1265,48 @@ ImageFile::writeImagePNG (const char *outfile, int bitdepth, int nxcell, int nyc
 #include "gd.h"
 static const int N_GRAYSCALE=256;
 
-void
-ImageFile::writeImageGIF (const char *outfile, int nxcell, int nycell, double densmin, double densmax)
+bool
+ImageFile::writeImageGIF (const char* const outfile, int nxcell, int nycell, double densmin, double densmax)
 {
-	gdImagePtr gif;
-	FILE *out;
-	int gs_indices[N_GRAYSCALE];
-	int nx = m_nx;
-	int ny = m_ny;
-	ImageFileArray v = getArray();
-	
-	unsigned char rowp [nx * nxcell];
-	if (rowp == NULL)
-		return;
-	
-	gif = gdImageCreate(nx * nxcell, ny * nycell);
-	for (int i = 0; i < N_GRAYSCALE; i++)
-		gs_indices[i] = gdImageColorAllocate(gif, i, i, i);
-	
-	int lastrow = ny * nycell - 1;
-	for (int irow = 0; irow < ny; irow++) {
-		int rpos = irow * nycell;
-		for (int ir = rpos; ir < rpos + nycell; ir++) {
-			for (int icol = 0; icol < nx; icol++) {
-				int cpos = icol * nxcell;
-				double dens = (v[icol][irow] - densmin) / (densmax - densmin);
-				dens = clamp(dens, 0., 1.);
-				for (int ic = cpos; ic < cpos + nxcell; ic++) {
-					rowp[ic] = (unsigned int) (dens * (double) (N_GRAYSCALE - 1));
-					gdImageSetPixel(gif, ic, lastrow - ir, gs_indices[rowp[ic]]);
-				}
-			}
-		}
-	}
-	
-	if ((out = fopen(outfile,"w")) == NULL) {
-		sys_error(ERR_FATAL, "Error opening output file %s for writing", outfile);
-		return (1);
-	}
-	gdImageGif(gif,out);
-	fclose(out);
-	gdImageDestroy(gif);
+  int gs_indices[N_GRAYSCALE];
+  int nx = m_nx;
+  int ny = m_ny;
+  ImageFileArray v = getArray();
+  
+  unsigned char* rowp = new unsigned char [nx * nxcell];
+  
+  gdImagePtr gif = gdImageCreate(nx * nxcell, ny * nycell);
+  for (int i = 0; i < N_GRAYSCALE; i++)
+    gs_indices[i] = gdImageColorAllocate(gif, i, i, i);
+  
+  int lastrow = ny * nycell - 1;
+  for (int irow = 0; irow < ny; irow++) {
+    int rpos = irow * nycell;
+    for (int ir = rpos; ir < rpos + nycell; ir++) {
+      for (int icol = 0; icol < nx; icol++) {
+        int cpos = icol * nxcell;
+        double dens = (v[icol][irow] - densmin) / (densmax - densmin);
+        dens = clamp(dens, 0., 1.);
+        for (int ic = cpos; ic < cpos + nxcell; ic++) {
+          rowp[ic] = (unsigned int) (dens * (double) (N_GRAYSCALE - 1));
+          gdImageSetPixel(gif, ic, lastrow - ir, gs_indices[rowp[ic]]);
+        }
+      }
+    }
+  }
+  
+  FILE *out;
+  if ((out = fopen (outfile,"w")) == NULL) {
+    sys_error(ERR_FATAL, "Error opening output file %s for writing", outfile);
+    return false;
+  }
+  gdImageGif(gif,out);
+  fclose(out);
+  gdImageDestroy(gif);
+
+  delete rowp;
+
+  return true;
 }
 #endif