Fighting JPEG Color Banding

1

Can I use

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2

Guetzli

Turns out there is a project which does that: https://github.com/google/guetzli.

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3

Kraken.io

How is this different from say, what https://kraken.io is doing. When I upload images there I get a smaller file size and the image looks no different.

#Image Optimisation #Image Editing #Image Processing 18 social mentions

4

mozjpeg

Guetzli was already mentioned and roughly does what you are talking about. MozJPEG [1] includes several quantization tables that are optimized for different contexts (see the quant-table flag and source code for specific tables[2]), and the default quantization table has been optimized to outperform the recommended quantization tables in the original JPEG spec (Annex K). It's also worth noting that MozJPEG uses Trellis quantization [3] to help improve quality without a per-image brute force quantization table search. Basically rather than determining an optimal quantization table for the image, it minimizes rate distortion on a per-block level by tuning the quantized coefficients. [1] https://github.com/mozilla/mozjpeg [2] https://github.com/mozilla/mozjpeg/blob/5c6a0f0971edf1ed3cf318d7b32308754305ac9a/jcparam.c#L74 [3] https://en.wikipedia.org/wiki/Trellis_quantization.

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