fidget spinnerdithering for better image qualityPNG vs JPEG image quality
dithering for better image quality
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Description: The limited precision of 8bit (s)RGB means visible banding can occur, particularly in darker areas with smooth gradients.  Adding dither trades off spatial resolution vs colour resolution, spreading the quantisation errors around so the end result is more perceptually uniform.  The next version of Kalles Fraktaler (2.12.2, coming soon) uses the deterministic a_dither algorithm described at http://pippin.gimp.org/a_dither/

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Keywords: dither image quality 
Posted by: claude September 20, 2017, 06:53:09 AM

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claude
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September 20, 2017, 06:58:40 AM
Note that downscaling (without dithering again) can undo the effect of the dithering, making banding visible again in the smaller previews.  View at full size with 1:1 image:display pixel scaling for best results.

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