ref: 3e880cd07d5d51005e48b7ea261a1419b84f134d
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}