[Magick-bugs] convert taking a grayscale image and turning it into RGB

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

> The pnm is RGB!

PNM supports monochrome, grayscale, and RGB but not colormapped.  To
force a colormapped image use -type Palette:

  convert mottle.pnm -type Palette ...