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8.3.0

Deprecations

TODO

TODO

API Changes

Changed WebP default "method" value when saving

Previously, it was 0, for the best speed. The default has now been changed to 4, to match WebP's default, for higher quality with still some speed optimisation.

Default resampling filter for special image modes

Pillow 7.0 changed the default resampling filter to Image.BICUBIC. However, as this is not supported yet for images with a custom number of bits, the default filter for those modes has been reverted to Image.NEAREST.

ImageMorph incorrect mode errors

For apply(), match() and get_on_pixels(), if the image mode is not L, an :pyException was thrown. This has now been changed to a :pyValueError.

API Additions

ImageOps.contain

Returns a resized version of the image, set to the maximum width and height within size, while maintaining the original aspect ratio.

To compare it to other ImageOps methods:

  • :py~PIL.ImageOps.fit expands an image until is fills size, cropping the parts of the image that do not fit.
  • :py~PIL.ImageOps.pad expands an image to fill size, without cropping, but instead filling the extra space with color.
  • :py~PIL.ImageOps.contain is similar to :py~PIL.ImageOps.pad, but it does not fill the extra space. Instead, the original aspect ratio is maintained. So unlike the other two methods, it is not guaranteed to return an image of size.

ICO saving: bitmap_format argument

By default, Pillow saves ICO files in the PNG format. They can now also be saved in BMP format, through the new bitmap_format argument:

im.save("out.ico", bitmap_format="bmp")

Security

Parsing XML

Pillow previously parsed XMP data using Python's xml module. However, this module is not secure.

  • :py~PIL.Image.Image.getexif has used xml to potentially retrieve orientation data since Pillow 7.2.0. It has been refactored to use re instead.
  • :py~PIL.JpegImagePlugin.JpegImageFile.getxmp was added in Pillow 8.2.0. It will now use defusedxml instead. If the dependency is not present, an empty dictionary will be returned and a warning raised.

Other Changes

Added DDS BC5 reading

Support has been added to read the BC5 format of DDS images, whether UNORM, SNORM or TYPELESS.