mirror of
https://github.com/python-pillow/Pillow.git
synced 2024-11-15 22:26:55 +03:00
66 lines
2.0 KiB
ReStructuredText
66 lines
2.0 KiB
ReStructuredText
3.4.0
|
|
-----
|
|
|
|
Backwards Incompatible Changes
|
|
==============================
|
|
|
|
Image.core.open_ppm removed
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
The nominally private/debugging function ``Image.core.open_ppm`` has
|
|
been removed. If you were using this function, please use
|
|
``Image.open`` instead.
|
|
|
|
Deprecations
|
|
============
|
|
|
|
Deprecation Warning when Saving JPEGs
|
|
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
JPEG images cannot contain an alpha channel. Pillow prior to 3.4.0
|
|
silently drops the alpha channel. With this release Pillow will now
|
|
issue a :py:exc:`DeprecationWarning` when attempting to save a ``RGBA`` mode
|
|
image as a JPEG. This will become an error in Pillow 4.2.
|
|
|
|
API Additions
|
|
=============
|
|
|
|
New resizing filters
|
|
^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Two new filters available for ``Image.resize()`` and ``Image.thumbnail()``
|
|
functions: ``BOX`` and ``HAMMING``. ``BOX`` is the high-performance filter with
|
|
two times shorter window than ``BILINEAR``. It can be used for image reduction
|
|
3 and more times and produces a sharper result than ``BILINEAR``.
|
|
|
|
``HAMMING`` filter has the same performance as ``BILINEAR`` filter while
|
|
providing the image downscaling quality comparable to ``BICUBIC``.
|
|
Both new filters don't show good quality for the image upscaling.
|
|
|
|
New DDS Decoders
|
|
^^^^^^^^^^^^^^^^
|
|
|
|
Pillow can now decode DXT3 images, as well as the previously supported
|
|
DXT1 and DXT5 formats. All three formats are now decoded in C code for
|
|
better performance.
|
|
|
|
Append images to GIF
|
|
^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Additional frames can now be appended when saving a GIF file, through the
|
|
``append_images`` argument. The new frames are passed in as a list of images,
|
|
which may be have multiple frames themselves.
|
|
|
|
Note that the ``append_images`` argument is only used if ``save_all`` is also
|
|
in effect, e.g.::
|
|
|
|
im.save(out, save_all=True, append_images=[im1, im2, ...])
|
|
|
|
Save multiple frame TIFF
|
|
^^^^^^^^^^^^^^^^^^^^^^^^
|
|
|
|
Multiple frames can now be saved in a TIFF file by using the ``save_all`` option.
|
|
e.g.::
|
|
|
|
im.save("filename.tiff", format="TIFF", save_all=True)
|