retrocomputing

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Has anyone C code to filter frames to 1bit color depth approximation? (fed.dyne.org)

submitted 10 months ago by jaromil@fed.dyne.org to c/retrocomputing@lemmy.sdf.org

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[–] vrighter@discuss.tchncs.de 18 points 10 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 10 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 10 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...

[–] Synthead@lemmy.world 6 points 10 months ago

Check out ImageMagick.

[–] cyberic@discuss.tchncs.de 5 points 10 months ago (1 children)

I would check out some tools written for the PlayDate game console (which is 1-bit)

https://devforum.play.date/t/playdither-a-web-tool-for-1-bit-image-dithering/5339

[–] jaromil@fed.dyne.org 2 points 10 months ago (1 children)

this is awesome!!!! thanks!!! <3

[–] GlitchyDigiBun@lemmy.dbzer0.com 1 points 10 months ago

Looks like the arduboy's display. Might look for some C++ arduino libraries. Additionally, it never hurts to have gimp/PS skills for stuff like this, and there are likely plugins for both.

[–] GrappleHat@lemmy.ml 4 points 10 months ago* (last edited 10 months ago) (2 children)

I don't understand the question. Are you looking for a tool which converts images to 1-bit? With dithering to simulate greys?

This art is super cool, btw! Where can I find more?

[–] jaromil@fed.dyne.org 3 points 10 months ago (2 children)

yes I'm looking for C algorithms for that. I just searched for "1bit old-school image"

[–] mrkite@programming.dev 3 points 10 months ago

Search for Floyd Steinberg dithering. That's the algorithm used by a lot of classic Mac software.

[–] GrappleHat@lemmy.ml 2 points 10 months ago

This web utility seems like exactly what you're describing. I think this was a small app someone made for themselves while developing a game for Playdate. The source might be available on their Github. If not they seem friendly, you could ask for it.

[–] otp@sh.itjust.works 2 points 10 months ago

It took me some time, but I realized they're asking "Does anyone have". I think.

They tried to use verb raising, which is where the verb is moved to the start of a sentence to ask a question. We usually only do it for "to be" (e.g., "is"), but we very rarely do it with "to have", so maybe that's where that came from.

(Think "John is good" becoming "Is John good?", instead of needing a question word or "do" at the start of the sentence)