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.
this post was submitted on 23 Nov 2023
37 points (100.0% liked)
retrocomputing
4629 readers
85 users here now
Discussions on vintage and retrocomputing
founded 2 years ago
MODERATORS
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...
I told you what to look for. It's a simple algorithm. Maybe try looking at the "implementation" section on the wikipedia page...
Check out ImageMagick.
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
this is awesome!!!! thanks!!! <3
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.
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?
yes I'm looking for C algorithms for that. I just searched for "1bit old-school image"
Search for Floyd Steinberg dithering. That's the algorithm used by a lot of classic Mac software.
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.
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)