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76 lines
2.7 KiB
ReStructuredText
76 lines
2.7 KiB
ReStructuredText
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3.1.0
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=====
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ImageDraw arc, chord and pieslice can now use floats
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----------------------------------------------------
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There is no longer a need to ensure that the start and end arguments for ``arc``,
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``chord`` and ``pieslice`` are integers.
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Note that these numbers are not simply rounded internally, but are actually
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utilised in the drawing process.
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Consistent multiline text spacing
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---------------------------------
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When using the ``ImageDraw`` multiline methods, the spacing between
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lines was inconsistent, based on the combination on ascenders and
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descenders.
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This has now been fixed, so that lines are offset by their baselines,
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not the absolute height of each line.
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There is also now a default spacing of 4px between lines.
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Exif, Jpeg and Tiff Metadata
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----------------------------
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There were major changes in the TIFF ImageFileDirectory support in
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Pillow 3.0 that led to a number of regressions. Some of them have been
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fixed in Pillow 3.1, and some of them have been extended to have
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different behavior.
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TiffImagePlugin.IFDRational
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+++++++++++++++++++++++++++
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Pillow 3.0 changed rational metadata to use a float. In Pillow 3.1,
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this has changed to allow the expression of 0/0 as a valid piece of
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rational metadata to reflect usage in the wild.
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Rational metadata is now encapsulated in an ``IFDRational``
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instance. This class extends the Rational class to allow a denominator
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of 0. It compares as a float or a number, but does allow access to the
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raw numerator and denominator values through attributes.
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When used in a ``ImageFileDirectory_v1``, a 2 item tuple is returned
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of the numerator and denominator, as was done previously.
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This class should be used when adding a rational value to an
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ImageFileDirectory for saving to image metadata.
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JpegImagePlugin._getexif
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++++++++++++++++++++++++
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In Pillow 3.0, the dictionary returned from the private, experimental,
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but generally widely used ``_getexif`` function changed to reflect the
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ImageFileDirectory_v2 format, without a fallback to the previous format.
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In Pillow 3.1, ``_getexif`` now returns a dictionary compatible with
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Pillow 2.9 and earlier, built with
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``ImageFileDirectory_v1`` instances. Additionally, any
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single item tuples have been unwrapped and return a bare element.
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The format returned by Pillow 3.0 has been abandoned. A more fully
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featured interface for EXIF is anticipated in a future release.
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Out of Spec Metadata
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++++++++++++++++++++
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In Pillow 3.0 and 3.1, images that contain metadata that is internally
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consistent, but not in agreement with the TIFF spec, may cause an
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exception when reading the metadata. This can happen when a tag that
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is specified to have a single value is stored with an array of values.
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It is anticipated that this behavior will change in future releases.
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