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#1 Re: GML Creations » Dithering for Game Design » 2011-10-07 04:16:18
A general question to a detail I'm missing in all the descriptions of dithering algorithms:
Shall the error values be able to accumulate to values even less than 0 or greater than 255?
If yes, then the error buffer can't be an image itself which is limited to 1-byte values per component... that is probably my mistake and explains the different appearance with stripes.
#2 Re: GML Creations » Dithering for Game Design » 2011-09-27 12:39:44
Yes, the error 500 is related to limitations of the server I'm using, and some strange behaviour of PHP -- taking incredible amounts of RAM, more than really necessary, way beyond 3x the size of the true-color image it shall process. I have no idea if I made a mistake in my PHP algorithm, if I could avoid it by including specific "tidy up!" commands...
License? Uhm ... it is a study, a "proof of concept", not an application for daily use. As the patent for Shiau-Fan is expected to run out quite soon, I wonder if I may even make the source public, but as mentioned, something is weird regarding memory consumption. Well ... after Ostromoukhov was implemented, maybe. Or it may disappear. Who knows.
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P.S.: I tried to discuss it in DoomWorld's image thread, after offering a few "sky cylinders" created from higher resolution panorama images using some "noise dither" to apply the DOOM PLAYPAL; but no replies so far.
#3 Re: GML Creations » Dithering for Game Design » 2011-09-26 01:02:47
Sorry for the delay - looks like I waited for a never sent reply notification... (and I can't upload an avatar either; maybe due to the post count?)
I included some variants from the documentation of libcaca; and also I successfully adapted some matrices on my own with interesting results (playing in another script - subject to changing unexpectedly).
#4 Re: GML Creations » Dithering for Game Design » 2011-09-07 05:09:47
Quite an interesting article, xot & all. Thank you for collecting so many matrices to compare.
I did not yet use GML, but was able to implement matrix based Image dithering with palette matching in PHP using GD2 functions, specifically to match true-color textures to e.g. the DOOM PLAYPAL (via imagecolorat, imagecolorclosest, imagecolorsforindex etc.), with reducable error distribution factor to avoid high-contrast stray pixels.
I believe that a YUV or HSL/HSV (instead of euklidean RGB space distance) based calculation of the closest available palette index color might improve the results further.
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