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Merge pull request #6135 from carandraug/document-jpeg-quality-keep

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Hugo van Kemenade 2022-03-31 21:34:02 +03:00 committed by GitHub
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docs/handbook/image-file-formats.rst
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@ -391,10 +391,12 @@ The :py:meth:`~PIL.Image.open` method may set the following
The :py:meth:`~PIL.Image.Image.save` method supports the following options: The :py:meth:`~PIL.Image.Image.save` method supports the following options:
**quality** **quality**
The image quality, on a scale from 0 (worst) to 95 (best). The default is The image quality, on a scale from 0 (worst) to 95 (best), or the string
75. Values above 95 should be avoided; 100 disables portions of the JPEG ``keep``. The default is 75. Values above 95 should be avoided; 100 disables
compression algorithm, and results in large files with hardly any gain in portions of the JPEG compression algorithm, and results in large files with
image quality. hardly any gain in image quality. The value ``keep`` is only valid for JPEG
files and will retain the original image quality level, subsampling, and
qtables.
**optimize** **optimize**
If present and true, indicates that the encoder should make an extra pass If present and true, indicates that the encoder should make an extra pass