/usr/share/ghostscript/lib
Edit: /usr/share/ghostscript/lib/ras3.upp (214B)
-supModel="SUN rasterfile, 3 Bit, 7 Colors (RGB-Ghostscript)"
-sDEVICE=uniprint
-dNOPAUSE
-P- -dSAFER
-dupColorModel=/DeviceRGB
-dupRendering=/ErrorDiffusion
-dupOutputFormat=/SunRaster
-dupComponentBits="{1 1 1}"