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156 lines
6.4 KiB
ReStructuredText
156 lines
6.4 KiB
ReStructuredText
7.0.0
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-----
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Backwards Incompatible Changes
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==============================
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Python 2.7
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^^^^^^^^^^
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Pillow has dropped support for Python 2.7, which reached end-of-life on 2020-01-01.
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PILLOW_VERSION constant
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^^^^^^^^^^^^^^^^^^^^^^^
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``PILLOW_VERSION`` has been removed. Use ``__version__`` instead.
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PIL.*ImagePlugin.__version__ attributes
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The version constants of individual plugins have been removed. Use ``PIL.__version__``
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instead.
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=============================== ================================= ==================================
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Removed Removed Removed
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=============================== ================================= ==================================
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``BmpImagePlugin.__version__`` ``Jpeg2KImagePlugin.__version__`` ``PngImagePlugin.__version__``
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``CurImagePlugin.__version__`` ``JpegImagePlugin.__version__`` ``PpmImagePlugin.__version__``
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``DcxImagePlugin.__version__`` ``McIdasImagePlugin.__version__`` ``PsdImagePlugin.__version__``
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``EpsImagePlugin.__version__`` ``MicImagePlugin.__version__`` ``SgiImagePlugin.__version__``
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``FliImagePlugin.__version__`` ``MpegImagePlugin.__version__`` ``SunImagePlugin.__version__``
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``FpxImagePlugin.__version__`` ``MpoImagePlugin.__version__`` ``TgaImagePlugin.__version__``
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``GdImageFile.__version__`` ``MspImagePlugin.__version__`` ``TiffImagePlugin.__version__``
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``GifImagePlugin.__version__`` ``PalmImagePlugin.__version__`` ``WmfImagePlugin.__version__``
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``IcoImagePlugin.__version__`` ``PcdImagePlugin.__version__`` ``XbmImagePlugin.__version__``
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``ImImagePlugin.__version__`` ``PcxImagePlugin.__version__`` ``XpmImagePlugin.__version__``
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``ImtImagePlugin.__version__`` ``PdfImagePlugin.__version__`` ``XVThumbImagePlugin.__version__``
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``IptcImagePlugin.__version__`` ``PixarImagePlugin.__version__``
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=============================== ================================= ==================================
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PyQt4 and PySide
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^^^^^^^^^^^^^^^^
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Qt 4 reached end-of-life on 2015-12-19. Its Python bindings are also EOL: PyQt4 since
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2018-08-31 and PySide since 2015-10-14.
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Support for PyQt4 and PySide has been removed from ``ImageQt``. Please upgrade to PyQt5
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or PySide2.
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Setting the size of TIFF images
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Setting the size of a TIFF image directly (eg. ``im.size = (256, 256)``) throws
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an error. Use ``Image.resize`` instead.
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Default resampling filter
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^^^^^^^^^^^^^^^^^^^^^^^^^
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The default resampling filter has been changed to the high-quality convolution
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``Image.BICUBIC`` instead of ``Image.NEAREST``, for the :py:meth:`~PIL.Image.Image.resize`
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method and the :py:meth:`~PIL.ImageOps.pad`, :py:meth:`~PIL.ImageOps.scale`
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and :py:meth:`~PIL.ImageOps.fit` functions.
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``Image.NEAREST`` is still always used for images in "P" and "1" modes.
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See :ref:`concept-filters` to learn the difference. In short,
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``Image.NEAREST`` is a very fast filter, but simple and low-quality.
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Image.draft() return value
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^^^^^^^^^^^^^^^^^^^^^^^^^^
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If the :py:meth:`~PIL.Image.Image.draft` method has no effect, it returns :data:`None`.
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If it does have an effect, then it previously returned the image itself.
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However, unlike other `chain methods`_, :py:meth:`~PIL.Image.Image.draft` does not
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return a modified version of the image, but modifies it in-place. So instead, if
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:py:meth:`~PIL.Image.Image.draft` has an effect, Pillow will now return a tuple
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of the image mode and a co-ordinate box. The box is the original coordinates in the
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bounds of resulting image. This may be useful in a subsequent
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:py:meth:`~PIL.Image.Image.resize` call.
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.. _chain methods: https://en.wikipedia.org/wiki/Method_chaining
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API Additions
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=============
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Custom unidentified image error
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Pillow will now throw a custom ``UnidentifiedImageError`` when an image cannot be
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identified. For backwards compatibility, this will inherit from ``OSError``.
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New argument ``reducing_gap`` for Image.resize() and Image.thumbnail() methods
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Speeds up resizing by resizing the image in two steps. The bigger ``reducing_gap``,
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the closer the result to the fair resampling. The smaller ``reducing_gap``,
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the faster resizing. With ``reducing_gap`` greater or equal to 3.0,
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the result is indistinguishable from fair resampling.
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The default value for :py:meth:`~PIL.Image.Image.resize` is :data:`None`,
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which means that the optimization is turned off by default.
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The default value for :py:meth:`~PIL.Image.Image.thumbnail` is 2.0,
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which is very close to fair resampling while still being faster in many cases.
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In addition, the same gap is applied when :py:meth:`~PIL.Image.Image.thumbnail`
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calls :py:meth:`~PIL.Image.Image.draft`, which may greatly improve the quality
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of JPEG thumbnails. As a result, :py:meth:`~PIL.Image.Image.thumbnail`
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in the new version provides equally high speed and high quality from any
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source (JPEG or arbitrary images).
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New Image.reduce() method
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^^^^^^^^^^^^^^^^^^^^^^^^^
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:py:meth:`~PIL.Image.Image.reduce` is a highly efficient operation
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to reduce an image by integer times. Normally, it shouldn't be used directly.
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Used internally by :py:meth:`~PIL.Image.Image.resize` and :py:meth:`~PIL.Image.Image.thumbnail`
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methods to speed up resize when a new argument ``reducing_gap`` is set.
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Loading WMF images at a given DPI
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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On Windows, Pillow can read WMF files, with a default DPI of 72. An image can
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now also be loaded at another resolution::
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from PIL import Image
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with Image.open("drawing.wmf") as im:
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im.load(dpi=144)
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Other Changes
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=============
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Image.__del__
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^^^^^^^^^^^^^
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Implicitly closing the image's underlying file in ``Image.__del__`` has been removed.
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Use a context manager or call :py:meth:`~PIL.Image.Image.close` instead to close
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the file in a deterministic way.
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Previous method::
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im = Image.open("hopper.png")
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im.save("out.jpg")
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Use instead::
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with Image.open("hopper.png") as im:
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im.save("out.jpg")
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Better thumbnail geometry
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^^^^^^^^^^^^^^^^^^^^^^^^^
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When calculating the new dimensions in :py:meth:`~PIL.Image.Image.thumbnail`,
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round to the nearest integer, instead of always rounding down.
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This better preserves the original aspect ratio.
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When the image width or height is not divisible by 8 the last row and column
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in the image get the correct weight after JPEG DCT scaling.
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