possible bug -posterize with dither IM 6.8.1.10 Q16

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fmw42
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possible bug -posterize with dither IM 6.8.1.10 Q16

Post by fmw42 »

IM 6.8.1.10 Q16 Mac OSX Snow Leopard.

Using the example colorwheel.png image at http://www.imagemagick.org/Usage/quantize/#posterize, I see no difference with dither on or off with these commands


convert colorwheel.png +dither -posterize 3 show:
convert colorwheel.png -dither Riemersma -posterize 3 show:
convert colorwheel.png -dither FloydSteinberg -posterize 3 show:
convert colorwheel.png -posterize 3 show:

Is this a bug or am I missing something?
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anthony
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Re: possible bug -posterize with dither IM 6.8.1.10 Q16

Post by anthony »

Dither does not work with posterize. I have no idea why, I reported it years ago.
Anthony Thyssen -- Webmaster for ImageMagick Example Pages
https://imagemagick.org/Usage/
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