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Release notes for PNG dos, Tiff parameter change

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wiredfool 2014-12-31 16:36:24 -08:00
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docs/releasenotes/2.7.0.rst
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@ -1,6 +1,21 @@
Pillow 2.7.0
============
Png text chunk size limits
--------------------------
To prevent potential denial of service attacks using compressed text
chunks, there are now limits to the decompressed size of text chunks
decoded from PNG images. If the limits are exceeded when opening a PNG
image a ``ValueError`` will be raised.
Individual text chunks are limited to
:py:attr:`PIL.PngImagePlugin.MAX_TEXT_CHUNK`, set to 1MB by
default. The total decompressed size of all text chunks is limited to
:py:attr:`PIL.PngImagePlugin.MAX_TEXT_MEMORY`, which defaults to
64MB. These values can be changed prior to opening PNG images if you
know that there are large text blocks that are desired.
Image resizing filters
----------------------
@ -141,3 +156,13 @@ The previous implementation takes into account only source pixels within
so the quality was worse compared to other Gaussian blur software.
The new implementation does not have this drawback.
TFF Parameter Changes
----------------------
Several kwarg parameters for saving TIFF images were previously
specified as strings with included spaces (e.g. 'x resolution'). This
was difficult to use as kwargs without constructing and passing a
dictionary. These parameters now use the underscore character instead
of space. (e.g. 'x_resolution')