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Fix mismatched name, add explanation.

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Mention why this information is not available in the EXIF tag specified for this purpose.
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mixmastamyk 2019-10-27 23:36:33 -07:00 committed by GitHub
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src/PIL/JpegPresets.py
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@ -33,7 +33,10 @@ Possible subsampling values are 0, 1 and 2 that correspond to 4:4:4, 4:2:2 and
4:2:0. 4:2:0.
You can get the subsampling of a JPEG with the You can get the subsampling of a JPEG with the
`JpegImagePlugin.get_subsampling(im)` function. `JpegImagePlugin.get_sampling(im)` function.
In JPEG compressed data a JPEG marker is used instead of an EXIF tag.
(ref.: https://www.exiv2.org/tags.html)
Quantization tables Quantization tables