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color reduction reduces brightness of white backgrounds

Posted: Tue Nov 21, 2023 5:33 pm
by corr
Trying to reduce a scanned document to 64 colors (dithering: none). However, the white background becomes darker. This is an effect that I cannot observe in Photoshop.

How can I preserve the white background in my image?

I can make a level afterwards, but it doesn't seem to me to be the best way to do this after color reduction.

Re: color reduction reduces brightness of white backgrounds

Posted: Thu Nov 23, 2023 7:42 am
by xnview
could you post a sample file?