halftone VS ESC-POS-.NET

The StackOverflow answer above is referenced by various Python halftoning projects, which have documented or at least commented halftone code you may be interested in:

https://github.com/ClayFlannigan/halftone

https://github.com/philgyford/python-halftone

I think grandparent post is right, that you’re looking for the terms like halftone, halftoning, digital halftoning, binary halftoning, and the like. These are the terms that show up in papers:

https://www.sciencedirect.com/science/article/abs/pii/S10473...

Text discussion at Wikipedia: https://en.wikipedia.org/wiki/Halftone

Having worked in digital press, I recall the term of art for a higher quality technique that came after “halftone screening” or “digital halftone” was “stochastic screening”:

https://en.wikipedia.org/wiki/Stochastic_screening

This prevented the tell-tale circle effect (moiré or rosette patterns) of traditional screening. We used it to print high quality magazine photography. It also worked on Mac Plus for rendering photography as a better dither for black and white dots of irregular or non-geometric photography — which brings us full circle to dithering.

Using terms from Photoshop of the day, Pattern Dither uses a uniform pattern to represent levels of gray. Diffusion Dither uses a random pattern to represent levels of gray. Halftone Screen uses preset patterns (round, diamond, ellipse, line, square or cross) at frequencies and angles that can be varied as well.

That brought another term to mind, “stippling”:

https://github.com/joeedh/BlueNoiseStippling

Some more terms show up in this discussion on difference between halftoning and dithering:

https://photo.stackexchange.com/questions/5779/what-is-the-d...

I've successfully used https://github.com/lukevp/ESC-POS-.NET for ESC/POS to control several brands of POS printers (but you won't use System.Drawing.Printing at all, you'll use ESC/POS to handle everything to the printer).

For ESC/POS look into: https://github.com/lukevp/ESC-POS-.NET (I haven't used this, but am currently looking into it for replacing OPOS).

I used Epson TM-T20III with https://github.com/lukevp/ESC-POS-.NET, works pretty well out of the box

My receipt printer library[0] uses dithering for images since the printers are black and white but fairly high resolution. It looks pretty decent [1], much better than a plain black and white conversion. I learned about dithering while implementing this library, and it’s a great technique! I originally implemented a black and white filter and then Floyd-steinberg dither natively in c# but then ended up using a library for it since we needed image transforms as well.

[0]: https://github.com/lukevp/ESC-POS-.NET

[1]: https://user-images.githubusercontent.com/59696671/106924665...