Formerly, I was not able to build PNG images due to a bug in pnmtopng provided in the linux distribution RedHat 5.2 But I got a source (suppoedly recent, from suse) which I finally succeeded to compile, so that is yields an image, instead of crashing. The new problem is that the PNG has a gray background, while the GIF is transparent. Of course I use the same pstoimg routine, just changing the configuration file (99.2 revision 1.29) ==> Is that grey background with PNG a bug, or a "feature"? -- ------------------------------------------------------------------------ Daniel Taupin, Physique des Solides, Univ. Paris-Sud, 91405 ORSAY E-mail= mailto:[EMAIL PROTECTED] Tél: (33)1.69.15.60.79, Fax: (33)1.69.15.60.86, home/fax: (33)1.60.10.26.44 ------------------------------------------------------------------------