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106 lines
3.5 KiB
ReStructuredText
106 lines
3.5 KiB
ReStructuredText
6.1.0
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-----
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Deprecations
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============
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Image.__del__
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^^^^^^^^^^^^^
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.. deprecated:: 6.1.0
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Implicitly closing the image's underlying file in ``Image.__del__`` has been deprecated.
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Use a context manager or call ``Image.close()`` instead to close the file in a
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deterministic way.
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Deprecated::
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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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API Additions
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=============
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Image.entropy
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^^^^^^^^^^^^^
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Calculates and returns the entropy for the image. A bilevel image (mode "1") is treated
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as a greyscale ("L") image by this method. If a mask is provided, the method employs
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the histogram for those parts of the image where the mask image is non-zero. The mask
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image must have the same size as the image, and be either a bi-level image (mode "1") or
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a greyscale image ("L").
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ImageGrab.grab
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^^^^^^^^^^^^^^
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An optional ``include_layered_windows`` parameter has been added to ``ImageGrab.grab``,
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defaulting to ``False``. If true, layered windows will be included in the resulting
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image on Windows.
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ImageSequence.all_frames
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^^^^^^^^^^^^^^^^^^^^^^^^
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A new method to facilitate applying a given function to all frames in an image, or to
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all frames in a list of images. The frames are returned as a list of separate images.
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For example, ``ImageSequence.all_frames(im, lambda im_frame: im_frame.rotate(90))``
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could be used to return all frames from an image, each rotated 90 degrees.
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Variation fonts
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^^^^^^^^^^^^^^^
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Variation fonts are now supported, allowing for different styles from the same font
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file. ``ImageFont.FreeTypeFont`` has four new methods,
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:py:meth:`PIL.ImageFont.FreeTypeFont.get_variation_names` and
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:py:meth:`PIL.ImageFont.FreeTypeFont.set_variation_by_name` for using named styles, and
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:py:meth:`PIL.ImageFont.FreeTypeFont.get_variation_axes` and
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:py:meth:`PIL.ImageFont.FreeTypeFont.set_variation_by_axes` for using font axes
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instead. An ``IOError`` will be raised if the font is not a variation font. FreeType
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2.9.1 or greater is required.
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Other Changes
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=============
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ImageTk.getimage
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^^^^^^^^^^^^^^^^
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This function is now supported. It returns the contents of an ``ImageTk.PhotoImage`` as
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an RGBA ``Image.Image`` instance.
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Image quality for JPEG compressed TIFF
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The TIFF encoder accepts a ``quality`` parameter for ``jpeg`` compressed TIFF files. A
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value from 0 (worst) to 100 (best) controls the image quality, similar to the JPEG
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encoder. The default is 75. For example::
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im.save("out.tif", compression="jpeg", quality=85)
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Improve encoding of TIFF tags
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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The TIFF encoder supports more types, especially arrays. This is required for the
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GeoTIFF format which encodes geospatial information.
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* Pass ``tagtype`` from v2 directory to libtiff encoder, instead of autodetecting type.
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* Use explicit types eg. ``uint32_t`` for ``TIFF_LONG`` to fix issues on platforms with
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64-bit longs.
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* Add support for multiple values (arrays). Requires type in v2 directory and values
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must be passed as a tuple.
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* Add support for signed types eg. ``TIFFTypes.TIFF_SIGNED_SHORT``.
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Respect PKG_CONFIG environment variable when building
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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This variable is commonly used by other build systems and using it can help with
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cross-compiling. Falls back to ``pkg-config`` as before.
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Top-to-bottom complex text rendering
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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Drawing text in the 'ttb' direction with ``ImageFont`` has been significantly improved
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and requires Raqm 0.7 or greater.
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