X-Git-Url: http://git.kpe.io/?p=cl-photo.git;a=blobdiff_plain;f=dof.lisp;h=8dfdf1478ac32981d9472a92fc1bb7d1d6e70e33;hp=ee9250a745c0d613716cdc405e798f8a8e191019;hb=431903301170bffaea3a481813a210dc407d0455;hpb=4860883d5bf05e9e7c83d4f16a001e4edd1d1cb2

diff --git a/dof.lisp b/dof.lisp
index ee9250a..8dfdf14 100644
--- a/dof.lisp
+++ b/dof.lisp
@@ -19,19 +19,29 @@
 
 (in-package #:photo)
 
+(defun sort-size (size)
+  "Returns a cons pair with the smaller size first."
+  (if (>= (car size) (cdr size))
+      (cons (cdr size) (car size))
+      (cons (car size) (cdr size))))
+  
+(defun print-magnification (imager-size print-size)
+  "Returns the magnification required between an imager and print sizes
+while taking crop into consideration."
+  (setf imager-size (sort-size imager-size))
+  (setf print-size (sort-size print-size))
+  (float (max (/ (car print-size) (car imager-size))
+	      (/ (cdr print-size) (cdr print-size)))))
+
 (defun coc (imager-size &key (lpm 5) (minimum-distance 250) 
                    (viewing-distance 250)
                    (print-size (output-dimensions :8x10in)))
   "Returns circle of confusion in mm and print magnification for a format. 
 Default resolving power is 5 lpm at 25cm."
-
-  (let* ((imager-diagonal (diagonal (car imager-size) (cdr imager-size)))
-         (print-diagonal (diagonal (car print-size) (cdr print-size)))
-         (resolution-factor (/ (* lpm print-diagonal minimum-distance)
-                               (* imager-diagonal viewing-distance)))
-         (coc (/ 1.0d0 resolution-factor))
-         (print-magnification (/ print-diagonal imager-diagonal)))
-    (values coc print-magnification)))
+  (let* ((magnification (print-magnification imager-size print-size))
+	 (resolution-factor (/ (* magnification lpm minimum-distance) viewing-distance))
+	 (coc (/ 1.0d0 resolution-factor)))
+    (values coc magnification)))
 
 (defun coc-format (format &key (lpm 5) (minimum-distance 250) 
                           (viewing-distance 250)
@@ -133,5 +143,3 @@ Output: NEAR-POINT, FAR-POINT, TOTAL-DOF, MAGNIFICATION, BLUR-SIZE-OF-INFINITY-P
 (defun mtf-scanner (freq dscan-freq &optional (order 3))
   (abs (expt (kmrcl:sinc (* pi (/ freq dscan-freq))) order)))
 
-(defun freq-mtf-scanner (dscan-freq mtf &optional (order 3))
-  (* dscan-freq (/ (asin (* x (exp  (/ (log mtf) order)))) pi)))