3 ms·
> Digital Halftones by Dot Diffusion Is that the same dot diffusion that is also mentioned here? http://caca.zoy.org/study/part3.html http://caca.zoy.org/stud
by vanderZwan 7y ago
> Digital Halftones by Dot Diffusion
Is that the same dot diffusion that is also mentioned here?
http://caca.zoy.org/study/part3.html http://caca.zoy.org/study/part3.html
If I understand the description that page correctly, dot diffusion visits pixels in Bayer order (instead of from left to right, top to bottom), and propagates error to all surrounding pixels that have not been visited yet. So yes, that does combine ordered dithering with error diffusion, but in a very different fashion than I do. The output (at least on the page that I've linked) is very half-tone ish.
- svat 7y agoIt's possibly the same (I'm not an expert, just aware of this reference from skimming through the book). Also, the first sentence of the abstract is "This paper describes a technique for approximating real-valued pixels by two-valued pixels" and the title says "halftones" so it wouldn't be surprising if the examples look half-tone ish :) Could you implement it and compare? Also, on your original page, what do the three columns under each algorithm (e.g. the three images under "Floyd-Steinberg" in the "Quick Refresher" section) mean?
- svat 7y agoHaha just read the page again properly: > Do not get fooled by Knuth’s apparent good results. They specifically target dot printers and do not give terribly good results on a computer screen. But of course! Knuth, as is his wont, was obviously not targeting computer screens or even targeting dot printers in general but a specific (Imagen) printer that happened to be on the Stanford campus. :-)
- vanderZwan 7y agoAh, that explanation makes a lot of sense actually! :)