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101 lines
3.6 KiB
ReStructuredText
101 lines
3.6 KiB
ReStructuredText
7.1.0
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-----
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API Changes
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===========
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Allow saving of zero quality JPEG images
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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If no quality was specified when saving a JPEG, Pillow internally used a value
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of zero to indicate that the default quality should be used. However, this
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removed the ability to actually save a JPEG with zero quality. This has now
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been resolved. ::
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from PIL import Image
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im = Image.open("hopper.jpg")
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im.save("out.jpg", quality=0)
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API Additions
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=============
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New channel operations
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^^^^^^^^^^^^^^^^^^^^^^
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Three new channel operations have been added: :py:meth:`~PIL.ImageChops.soft_light`,
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:py:meth:`~PIL.ImageChops.hard_light` and :py:meth:`~PIL.ImageChops.overlay`.
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PILLOW_VERSION constant
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^^^^^^^^^^^^^^^^^^^^^^^
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``PILLOW_VERSION`` has been re-added but is deprecated and will be removed in a future
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release. Use ``__version__`` instead.
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It was initially removed in Pillow 7.0.0, but brought back in 7.1.0 to give projects
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more time to upgrade.
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Reading JPEG comments
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^^^^^^^^^^^^^^^^^^^^^
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When opening a JPEG image, the comment may now be read into
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:py:attr:`~PIL.Image.Image.info`.
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Support for different charset encodings in PcfFontFile
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Previously ``PcfFontFile`` output only bitmap PIL fonts with ISO 8859-1 encoding, even
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though the PCF format supports Unicode, making it hard to work with Pillow with bitmap
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fonts in languages which use different character sets.
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Now it's possible to set a different charset encoding in ``PcfFontFile``'s class
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constructor. By default, it generates a PIL font file with ISO 8859-1 as before. The
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generated PIL font file still contains up to 256 characters, but the character set is
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different depending on the selected encoding.
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To use such a font with ``ImageDraw.text``, call it with a bytes object with the same
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encoding as the font file.
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X11 ImageGrab.grab()
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^^^^^^^^^^^^^^^^^^^^
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Support has been added for ``ImageGrab.grab()`` on Linux using the X server
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with the XCB library.
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An optional ``xdisplay`` parameter has been added to select the X server,
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with the default value of :data:`None` using the default X server.
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Passing a different value on Windows or macOS will force taking a snapshot
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using the selected X server; pass an empty string to use the default X server.
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XCB support is not included in pre-compiled wheels for Windows and macOS.
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Security
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========
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This release includes security fixes.
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* :cve:`2020-10177` Fix multiple out-of-bounds reads in FLI decoding
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* :cve:`2020-10378` Fix bounds overflow in PCX decoding
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* :cve:`2020-10379` Fix two buffer overflows in TIFF decoding
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* :cve:`2020-10994` Fix bounds overflow in JPEG 2000 decoding
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* :cve:`2020-11538` Fix buffer overflow in SGI-RLE decoding
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Other Changes
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=============
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If present, only use alpha channel for bounding box
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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When the :py:meth:`~PIL.Image.Image.getbbox` method calculates the bounding
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box, for an RGB image it trims black pixels. Similarly, for an RGBA image it
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would trim black transparent pixels. This is now changed so that if an image
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has an alpha channel (RGBA, RGBa, PA, LA, La), any transparent pixels are
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trimmed.
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Improved APNG support
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^^^^^^^^^^^^^^^^^^^^^
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Added support for reading and writing Animated Portable Network Graphics (APNG) images.
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The PNG plugin now supports using the :py:meth:`~PIL.Image.Image.seek` method and the
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:py:class:`~PIL.ImageSequence.Iterator` class to read APNG frame sequences.
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The PNG plugin also now supports using the ``append_images`` argument to write APNG frame
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sequences. See :ref:`apng-sequences` for further details.
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