> Use `print-color-mode-{supported,default}=bi-level` instead of `monochrome` for that

The last time I checked (a year ago), 1bpp was suddenly supported only by Windows. IIRC, monochrome is REQUIRED, while bi-level is OPTIONAL in RFC.

Not sure how things stand now, though. Ever since then, I've just been carrying Floyd–Steinberg dithering around.