I've been able to convert an image from 8 bit to 4 bit with the following command:
nconvert.exe -o 1bit.bmp -wflag os2 -colors -16 8bit.bmp
But I am not able to convert to a true monochrome image with 1 bit per pixel, even when I set -colors to 2 or 1. How can I convert to a 1 bpp image?
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