9.1.0¶
API Changes¶
Raise an error when performing a negative crop¶
Performing a negative crop on an image previously just returned a (0, 0) image. Now
it will raise a ValueError, to help reduce confusion if a user has unintentionally
provided the wrong arguments.
Added specific error if path coordinate type is incorrect¶
Rather than returning a SystemError, passing the incorrect types of coordinates into
a path will now raise a more specific ValueError, with the message “incorrect
coordinate type”.
Replace requirements.txt with extras¶
Rather than installing all dependencies for docs and tests via requirements.txt,
extras_require is used instead. This installs only those needed and at the same
time as installing Pillow.
For example:
# Install with dependencies for tests:
python3 -m pip install .[tests]
# Or for building docs:
python3 -m pip install .[docs]
# Or for all:
python3 -m pip install .[docs,tests]
On macOS, the last argument may need to be wrapped in quotes, e.g.
python3 -m pip install ".[tests]"
Therefore requirements.txt has been removed along with the make install-req
command for installing its contents.
Deprecations¶
Constants¶
A number of constants have been deprecated and will be removed in Pillow 10.0.0
(2023-07-01). Instead, enum.IntEnum classes have been added.
Note
Some of these deprecations were restored in Pillow 9.4.0. See Constants
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ImageShow.Viewer.show_file file argument¶
The file argument in show_file() has been
deprecated and will be removed in Pillow 10.0.0 (2023-07-01). It has been replaced by
path.
In effect, viewer.show_file("test.jpg") will continue to work unchanged.
viewer.show_file(file="test.jpg") will raise a deprecation warning, and suggest
viewer.show_file(path="test.jpg") instead.
FitsStubImagePlugin¶
Deprecated since version 9.1.0.
The stub image plugin FitsStubImagePlugin has been deprecated and will be removed in
Pillow 10.0.0 (2023-07-01). FITS images can be read without a handler through
FitsImagePlugin instead.
API Additions¶
Added get_photoshop_blocks() to parse Photoshop TIFF tag¶
get_photoshop_blocks() has been added, to
allow users to determine what Photoshop “Image Resource Blocks” are contained within an
image. The keys of the returned dictionary are the image resource IDs.
At present, the information within each block is merely returned as a dictionary with a “data” entry. This will allow more useful information to be added in the future without breaking backwards compatibility.
Added mct and no_jp2 options for saving JPEG 2000¶
The PIL.Image.Image.save() method now supports the following options for
JPEG 2000:
- mct
If
1then enable multiple component transformation when encoding, otherwise use0for no component transformation (default). If MCT is enabled andirreversibleisTruethen the Irreversible Color Transformation will be applied, otherwise encoding will use the Reversible Color Transformation. MCT works best with amodeofRGBand is only applicable when the image data has 3 components.- no_jp2
If
Truethen don’t wrap the raw codestream in the JP2 file format when saving, otherwise the extension of the filename will be used to determine the format (default).
Added PyEncoder¶
PyEncoder has been added, allowing for file encoders to be
written in Python. See Writing Your Own File Codec in Python for
more information.
GifImagePlugin loading strategy¶
Pillow 9.0.0 introduced the conversion of subsequent GIF frames to RGB or RGBA. This
behaviour can now be changed so that the first P frame is converted to RGB as
well.
from PIL import GifImagePlugin
GifImagePlugin.LOADING_STRATEGY = GifImagePlugin.LoadingStrategy.RGB_ALWAYS
Or subsequent frames can be kept in P mode as long as there is only a single
palette.
from PIL import GifImagePlugin
GifImagePlugin.LOADING_STRATEGY = GifImagePlugin.LoadingStrategy.RGB_AFTER_DIFFERENT_PALETTE_ONLY
Other Changes¶
musllinux wheels¶
Pillow now builds binary wheels for musllinux, suitable for Linux distributions based on the musl C standard library such as Alpine (rather than the glibc library used by manylinux wheels). See PEP 656.
ImageShow temporary files on Unix¶
When calling show() or using ImageShow,
a temporary file is created from the image. On Unix, Pillow will no longer delete these
files, and instead leave it to the operating system to do so.
Image._repr_pretty_¶
im._repr_pretty_ has been added to provide a representation of an image without the
identity of the object. This allows Jupyter to describe an image and have that
description stay the same on subsequent executions of the same code.
Added BigTIFF reading¶
Support has been added for reading BigTIFF images.
Added BLP saving¶
Support has been added for saving BLP images. blp_version can be used to specify
whether the image should be saved as BLP1 or BLP2, e.g.
im.save("out.blp", blp_version="BLP1"). By default, BLP2 will be used.