ref: 1c793f2803e0eecb47a1f6e6847e3749d8fd7173
dir: /sys/src/cmd/gs/lib/ras8m.upp/
-supModel="SUN rasterfile, 8 Bit, 2 Colors (Error-Diffusion)"
-sDEVICE=uniprint
-dNOPAUSE
-dSAFER
-dupColorModel=/DeviceGray
-dupRendering=/ErrorDiffusion
-dupOutputFormat=/SunRaster
-dupComponentBits={8}