this post was submitted on 23 Nov 2023
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retrocomputing

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Has anyone C code to filter frames to 1bit color depth approximation? (fed.dyne.org)
submitted 11 months ago by jaromil@fed.dyne.org to c/retrocomputing@lemmy.sdf.org
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[–] vrighter@discuss.tchncs.de 17 points 11 months ago (1 children)

you want to convert the image to grayscale properly (using luminance, not the mean of the rgb colors), then you can palettize it using a dithering algorithm like floyd-steinberg, with a palette containing only the colors black and white.

[–] jaromil@fed.dyne.org 0 points 11 months ago (1 children)

I'm looking for a source code in C that does that, to include it in frei0r, before I have to go and write it myself...

[–] vrighter@discuss.tchncs.de 1 points 11 months ago

I told you what to look for. It's a simple algorithm. Maybe try looking at the "implementation" section on the wikipedia page...