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Nelson Minar
Blog licensed under a Creative Commons License
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netpbm, originally by
Jef Poskanzer, is good software.
Simple Unix command line tools for images: convert formats, scale,
manipulate. Long before Photoshop and Gimp there was pbmplus, and long
after there still will be.
I was surprised to learn that after 15 years the netpbm team has added a new format, PAM. It's a superset of PBM, PGM, and PPM: the header now has keywords next to values and a new "tupletype" keyword is added to specify "BLACKANDWHITE", "GRAYSCALE", or "RGB". The purpose of this seems to be to support alpha channels in netpbm. Tuple types "RGB_ALPHA" and "GRAYSCALE_ALPHA" are on their way. |
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