ref: 6ff5c10ffb06d10eee06f1d432f9cc4738496c07
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}