Hi, Very old issue, but let's see if I can add something useful to the discussion.
ppmtowinicon relies only on grayscale images (PGM, or PBM as a particular case of PGM) as alpha masks because it is easier to make assumption about what the transparent and opaque areas are going to be in this case (white color means opaque, non-white means transparent); if you use a color image as alpha mask what color do you take as the transparent area? In your example, by running ppmtopgm you are actually adding the assumption that the white "color" is meant to be the opaque area, well, it is not so trivial in general. Using grayscale images for alpha masks makes sense because it is easy. FWIW I think this bug can be closed as well. Regards, Antonio -- Antonio Ospite http://ao2.it PGP public key ID: 0x4553B001 A: Because it messes up the order in which people normally read text. See http://en.wikipedia.org/wiki/Posting_style Q: Why is top-posting such a bad thing?
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