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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:
**quality**
The image quality, on a scale from 0 (worst) to 95 (best). The default is
75. Values above 95 should be avoided; 100 disables portions of the JPEG
compression algorithm, and results in large files with hardly any gain in
image quality.
The image quality, on a scale from 0 (worst) to 95 (best), or the string
``keep``. The default is 75. Values above 95 should be avoided; 100 disables
portions of the JPEG compression algorithm, and results in large files with
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**
If present and true, indicates that the encoder should make an extra pass