Posted By
MMS
on 2018-09-26
15:39:30
 |  Re: sic-p4 image converter
Nice list of improvement, and the quality also greatly enhanced. :-)
Some personal comments from me on conversion (I am not the professional one here, but in the last 8-10 years converted some hundred pictures just for fun :-) )
Floyd-Steinberg never really worked for me.
While Bayer looks like an old AppleII / MAC B/W picture scan, Floyd is only one step better in my eyes.
In IstvanV converter I prefer Jarvis, Stucki and Sierra2 (in this sequence). I think they do a nicer dithering and more natural transient between colors than Floyd, and they do not let big areas converted without shading.
Not all work for all the pictures, if I have a "bad" area after conversion I try out the others too, playing with the parameters.
To convert a picture with sharp text, floyd is better, but for dithered color photos the Jarvis looks much better.
There are some good articles comparing the different dithering methods for photos. There are good quality pictures you can compare them to each other. (so I know, that there are newer and even better ones). Maybe worth to check out Atkinson and Burkes too. Sierra is more for speed.
https://brucebcampbell.files.wordpress.com/2013/04/dithering-methods.pdf
http://www.tannerhelland.com/4660/dithering-eleven-algorithms-source-code/
http://ijiet.com/wp-content/uploads/2015/03/46.pdf
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