Graphics Image Processing
You have found the way to Image Processing on Graphics:
DA's Picture - [Freeware] Formerly commercial package for OS 3.5 and above.
Mksprite - Makes pretty optimal sprite files from draw and Euclid files.
Sfmerge - Very simple utility that merges several sprite files into one.
SpriteClean - Designed to clean up random specks from scanned images, but will also automatically crop.
Variations - Applies a range of changes, to a greater and lesser extent, to an image, showing 9 possible outcomes.
Widget5 - Image-processing package that supports 256 grey level (8bit), 65536 grey level (16bit) and 16.7 million colour (24bit) images. Help build the largest human-edited directory on the web.