docs/releasenotes/4.2.0.rst
Several deprecated items have been removed ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The methods PIL.ImageWin.Dib.fromstring,
PIL.ImageWin.Dib.tostring and
PIL.TiffImagePlugin.ImageFileDirectory_v2.as_dict have
been removed.
Before Pillow 4.2.0, attempting to save an RGBA image as JPEG would
discard the alpha channel. From Pillow 3.4.0, a deprecation warning
was shown. From Pillow 4.2.0, the deprecation warning is removed and
an :py:exc:IOError is raised.
Removed core Image function ^^^^^^^^^^^^^^^^^^^^^^^^^^^
The unused function Image.core.new_array was removed. This is an
internal function that should not have been used by user code, but it
was accessible from the python layer.
Added complex text rendering ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Pillow now supports complex text rendering for scripts requiring glyph
composition and bidirectional flow. This optional feature adds three
dependencies: harfbuzz, fribidi, and raqm. See the :doc:install documentation <../installation> for further details. This feature is tested and works on
Unix and Mac, but has not yet been built on Windows platforms.
New optional parameters ^^^^^^^^^^^^^^^^^^^^^^^
:py:meth:PIL.ImageDraw.floodfill has a new optional parameter:
threshold. This specifies a tolerance for the color to replace with
the flood fill.
The TIFF and PDF image writers now support the append_images
optional parameter for specifying additional images to create
multipage outputs.
New DecompressionBomb warning ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
:py:meth:PIL.Image.Image.crop now may raise a DecompressionBomb
warning if the crop region enlarges the image over the threshold
specified by :py:data:PIL.Image.MAX_IMAGE_PIXELS.