Comment by ValdikSS

If anyone interested in experimenting with dithering/halftoning algorithms in postscript, take a look at https://printserver.ink/blog/ghostscript-halftone/

You can implement it in PostScript, and there are many examples (with the PostScript code) in PDF specification (pages 303-307): https://opensource.adobe.com/dc-acrobat-sdk-docs/standards/p...