Che Burashka on wrote...
| Hi,
|
| I didn't realise I had to use ordered dither. It now
| works perfectly. Thanks!
|
| Andrey.
|
The latest IMs (v6.3) saw a major expansion to the order-dither function
that I spent a month working on to get right, and as a direct result of
a new technique developed in IM Examples.
DIY Dither Patterns
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/quantize/#diy_dither
As a result of this...
You can list the available ordered dither threshold maps, and their
backward compatibility alias name...
convert -list threshold
You can now define your own personal ordered dither maps!!!
For example a diagonal shadowing map for GIF...
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/quantize/#thresholds_xml
and you can use a posterized, or mathematical color table, for
generallized ordered dithering of images.
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/quantize/#od_posterize
For animations this type of dithering is much better than the error
correctly dithering, as it does not generate large areas of color
differences, for a small change (even a single pixel change) to an
image. See
Error Correction Dithering problems...
http://www.cit.gu.edu.au/~anthony/graphics/imagick6/quantize/#dither_error
I have not however gotten around to updating GIF animation pages with
this discussion and techniques as I am concentrating on some other
things. As such GIF animation color optimizations are a little output
date now.
Anthony Thyssen ( System Programmer ) <[EMAIL PROTECTED]>
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If your going to have delusions, you might as well go for the
really satisfying ones. -- Marcus, Babylon 5
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Anthony's Home is his Castle http://www.cit.gu.edu.au/~anthony/
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