What chroma subsampling rate (e.g., 4:2:0 or 4:2:2) does imwrite use when saving a JPEG image?

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Tyler Bell 2016-11-7

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评论： Diego Ayala 2022-2-8

What chroma subsampling rate (e.g., 4:2:0 or 4:2:0) does imwrite use when saving a JPEG image, by default?

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DGM 2021-4-10

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I know this is an old question, but I just had to figure it out myself. Imwrite uses 4:2:0 chroma subsampling, and the default quality setting is 75%. Somebody must really love crispy jpeg artifacts.

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Diego Ayala 2022-2-8

Thanks for clarifying this, currently working on a new image compression format and comparing to JPG generated by Matlab, this informmation is useful.

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