NetPbm: tools for manipulating images
9.25
Netpbm is a package of graphics programs and programming libraries. There are over 220 separate programs in the package, most of which have "pbm", "pgm", "ppm", or "pnm" in their names. For example, pnmscale and giftopnm. For example, you might use pnmscale to shrink an image by 10%. Or use pnmcomp to overlay one image on top of another. Or use pbmtext to create an image of text. Or reduce the number of colors in an image with ppmquant.
netpbm-9.25 can be downloaded from the GnuWin32 download page.