I would have appreciated a comment on the origin of I_Circle. It isn't obvious that "iml_header.h" constructs an enum of all images of IMAGEFILE named "I_<name_of_image>". Or is this analysis wrong?
4. Loading Images from file
TIF (TIFF) and PNG files don't seem to work. Although I checked the validity of the respective files the program responded: "No image loaded!" (Yes! I added plugin\tif and plugin\png.)
5. Processing raster images by scanlines
Apart from TIF (TIFF) and PNG files (cmp. #4) BMP files don't work.