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doc: document "keep" for JPEG save quality option.

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David Miguel Susano Pinto 2022-03-14 17:01:03 +00:00
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docs/handbook/image-file-formats.rst
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@ -364,10 +364,13 @@ 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
quantization tables.
**optimize**
If present and true, indicates that the encoder should make an extra pass