[magick-developers] Default settings for convert

[duc.sequere.aut.de.via.decede at imagemagick.org]

> > o, i get completely black picture, 1 MB in size (!).

Maybe your imaging program can't handle 16-bit PNM image files.  Try

  convert -density 400x400 infile.ps -resize 25% -depth 8 infile.ppm

Does that work for you?