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Better chroma subsampling #5

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Ser-Gen opened this issue Jan 12, 2019 · 0 comments

Ser-Gen commented Jan 12, 2019

Current subsampling implementation, as in libjpeg, makes contrast colors look blurry.
There are an attempts to make it better.

source 186289

petitojpeg 90 4:2:0 51118

sjpeg 90 4:2:0 sharp 51071

About implementations.
Some info from mozjpeg issues.
mozilla/mozjpeg#8
mozilla/mozjpeg#193
https://github.com/kornelski/jpeg-compressor#subsampling
https://github.com/kornelski/jpeg-compressor/blob/9eeb009fdb8673224de5be978574cb139e4b8bf6/jpge.cpp#L611

sjpeg has sharp yuv, like in webp, gives closer result.
https://github.com/webmproject/sjpeg

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