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Add release notes for #3608, #3861 and #3886 (#3930)

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Add release notes for #3608, #3861 and #3886
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Hugo 2019-07-01 13:11:33 +03:00 committed by GitHub
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6
CHANGES.rst
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@ -5,6 +5,12 @@ Changelog (Pillow)
6.1.0 (unreleased)
------------------
- Deprecate Image.__del__ #3929
[jdufresne]
- Tiff: Add support for JPEG quality #3886
[olt]
- Respect the PKG_CONFIG environment variable when building #3928
[chewi]

42
docs/releasenotes/6.1.0.rst
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@ -30,6 +30,14 @@ Use instead:
API Additions
=============
Image.entropy
^^^^^^^^^^^^^
Calculates and returns the entropy for the image. A bilevel image (mode "1") is treated
as a greyscale ("L") image by this method. If a mask is provided, the method employs
the histogram for those parts of the image where the mask image is non-zero. The mask
image must have the same size as the image, and be either a bi-level image (mode "1") or
a greyscale image ("L").
ImageGrab.grab
^^^^^^^^^^^^^^
@ -66,8 +74,38 @@ ImageTk.getimage
This function is now supported. It returns the contents of an ``ImageTk.PhotoImage`` as
an RGBA ``Image.Image`` instance.
Top To Bottom Complex Text Rendering
Image quality for JPEG compressed TIFF
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The TIFF encoder accepts a ``quality`` parameter for ``jpeg`` compressed TIFF files. A
value from 0 (worst) to 100 (best) controls the image quality, similar to the JPEG
encoder. The default is 75. For example:
.. code-block:: python
im.save("out.tif", compression="jpeg", quality=85)
Improve encoding of TIFF tags
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The TIFF encoder supports more types, especially arrays. This is required for the
GeoTIFF format which encodes geospatial information.
* Pass ``tagtype`` from v2 directory to libtiff encoder, instead of autodetecting type.
* Use explicit types eg. ``uint32_t`` for ``TIFF_LONG`` to fix issues on platforms with
64-bit longs.
* Add support for multiple values (arrays). Requires type in v2 directory and values
must be passed as a tuple.
* Add support for signed types eg. ``TIFFTypes.TIFF_SIGNED_SHORT``.
Respect PKG_CONFIG environment variable when building
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
This variable is commonly used by other build systems and using it can help with
cross-compiling. Falls back to ``pkg-config`` as before.
Top-to-bottom complex text rendering
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Drawing text in the 'ttb' direction with ImageFont has been significantly improved
Drawing text in the 'ttb' direction with ``ImageFont`` has been significantly improved
and requires Raqm 0.7 or greater.