} else if (color_type == PNG_COLOR_TYPE_RGB) {
if (bit_depth == 8) {
int iBase = ix * 3;
double dR = row_pointers[iy][iBase] / 255.;
double dG = row_pointers[iy][iBase+1] / 255.;
double dB = row_pointers[iy][iBase+2] / 255.;
} else if (color_type == PNG_COLOR_TYPE_RGB) {
if (bit_depth == 8) {
int iBase = ix * 3;
double dR = row_pointers[iy][iBase] / 255.;
double dG = row_pointers[iy][iBase+1] / 255.;
double dB = row_pointers[iy][iBase+2] / 255.;