rleflip	Perform gross (90 degree) rotation
repos	Change offset in header
crop	Prune image
ldmap	Create colormap (linear, gamma-corrected)
applymap	Apply colormap to image
to8	Dither 24 bit image (256-elt color map still has
	24 bit colors)
tobw	24 bits to 8 using YIQ transform
painttorle	with rletopaint, a MacPaint interface