Well, I have bmptoppm proggie... then I have ppmtopgm... and then pgmtopbm. So your script will look something like:
bmptoppm file.ppm | ppmtopgm | pgmtopbm > file.pbm I don't know *for sure* which package those tools came with, but I think it must be one (or both) of the following: ,---- | Opt graphics netpbm 19940301.2- 19940301.2- Graphics conversion tools | Opt graphics pnmtopng 2.37.3-1 2.37.3-1 PNG <-> netpbm (pnm, pbm, `---- HTH, -- Arcady Genkin http://www.thpoon.com "'What good is my pity? Is not the pity the cross upon which he who loves man is nailed?..'" (Zarathustra - F. Nietzsche)