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.

Deprecated

Use instead

Image.NONE

Either Image.Dither.NONE or Image.Resampling.NEAREST

Image.NEAREST

Either Image.Dither.NONE or Image.Resampling.NEAREST

Image.ORDERED

Image.Dither.ORDERED

Image.RASTERIZE

Image.Dither.RASTERIZE

Image.FLOYDSTEINBERG

Image.Dither.FLOYDSTEINBERG

Image.WEB

Image.Palette.WEB

Image.ADAPTIVE

Image.Palette.ADAPTIVE

Image.AFFINE

Image.Transform.AFFINE

Image.EXTENT

Image.Transform.EXTENT

Image.PERSPECTIVE

Image.Transform.PERSPECTIVE

Image.QUAD

Image.Transform.QUAD

Image.MESH

Image.Transform.MESH

Image.FLIP_LEFT_RIGHT

Image.Transpose.FLIP_LEFT_RIGHT

Image.FLIP_TOP_BOTTOM

Image.Transpose.FLIP_TOP_BOTTOM

Image.ROTATE_90

Image.Transpose.ROTATE_90

Image.ROTATE_180

Image.Transpose.ROTATE_180

Image.ROTATE_270

Image.Transpose.ROTATE_270

Image.TRANSPOSE

Image.Transpose.TRANSPOSE

Image.TRANSVERSE

Image.Transpose.TRANSVERSE

Image.BOX

Image.Resampling.BOX

Image.BILINEAR

Image.Resampling.BILINEAR

Image.LINEAR

Image.Resampling.BILINEAR

Image.HAMMING

Image.Resampling.HAMMING

Image.BICUBIC

Image.Resampling.BICUBIC

Image.CUBIC

Image.Resampling.BICUBIC

Image.LANCZOS

Image.Resampling.LANCZOS

Image.ANTIALIAS

Image.Resampling.LANCZOS

Image.MEDIANCUT

Image.Quantize.MEDIANCUT

Image.MAXCOVERAGE

Image.Quantize.MAXCOVERAGE

Image.FASTOCTREE

Image.Quantize.FASTOCTREE

Image.LIBIMAGEQUANT

Image.Quantize.LIBIMAGEQUANT

ImageCms.INTENT_PERCEPTUAL

ImageCms.Intent.PERCEPTUAL

ImageCms.INTENT_RELATIVE_COLORMETRIC

ImageCms.Intent.RELATIVE_COLORMETRIC

ImageCms.INTENT_SATURATION

ImageCms.Intent.SATURATION

ImageCms.INTENT_ABSOLUTE_COLORIMETRIC

ImageCms.Intent.ABSOLUTE_COLORIMETRIC

ImageCms.DIRECTION_INPUT

ImageCms.Direction.INPUT

ImageCms.DIRECTION_OUTPUT

ImageCms.Direction.OUTPUT

ImageCms.DIRECTION_PROOF

ImageCms.Direction.PROOF

ImageFont.LAYOUT_BASIC

ImageFont.Layout.BASIC

ImageFont.LAYOUT_RAQM

ImageFont.Layout.RAQM

BlpImagePlugin.BLP_FORMAT_JPEG

BlpImagePlugin.Format.JPEG

BlpImagePlugin.BLP_ENCODING_UNCOMPRESSED

BlpImagePlugin.Encoding.UNCOMPRESSED

BlpImagePlugin.BLP_ENCODING_DXT

BlpImagePlugin.Encoding.DXT

BlpImagePlugin.BLP_ENCODING_UNCOMPRESSED_RAW_RGBA

BlpImagePlugin.Encoding.UNCOMPRESSED_RAW_RGBA

BlpImagePlugin.BLP_ALPHA_ENCODING_DXT1

BlpImagePlugin.AlphaEncoding.DXT1

BlpImagePlugin.BLP_ALPHA_ENCODING_DXT3

BlpImagePlugin.AlphaEncoding.DXT3

BlpImagePlugin.BLP_ALPHA_ENCODING_DXT5

BlpImagePlugin.AlphaEncoding.DXT5

FtexImagePlugin.FORMAT_DXT1

FtexImagePlugin.Format.DXT1

FtexImagePlugin.FORMAT_UNCOMPRESSED

FtexImagePlugin.Format.UNCOMPRESSED

PngImagePlugin.APNG_DISPOSE_OP_NONE

PngImagePlugin.Disposal.OP_NONE

PngImagePlugin.APNG_DISPOSE_OP_BACKGROUND

PngImagePlugin.Disposal.OP_BACKGROUND

PngImagePlugin.APNG_DISPOSE_OP_PREVIOUS

PngImagePlugin.Disposal.OP_PREVIOUS

PngImagePlugin.APNG_BLEND_OP_SOURCE

PngImagePlugin.Blend.OP_SOURCE

PngImagePlugin.APNG_BLEND_OP_OVER

PngImagePlugin.Blend.OP_OVER

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 1 then enable multiple component transformation when encoding, otherwise use 0 for no component transformation (default). If MCT is enabled and irreversible is True then the Irreversible Color Transformation will be applied, otherwise encoding will use the Reversible Color Transformation. MCT works best with a mode of RGB and is only applicable when the image data has 3 components.

no_jp2

If True then 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.