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
Tyler Bell on 7 Nov 2016
Commented: Diego Ayala on 8 Feb 2022
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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Answers (1)

DGM
DGM on 10 Apr 2021
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
Diego Ayala on 8 Feb 2022
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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