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42 lines
1.2 KiB
ReStructuredText
42 lines
1.2 KiB
ReStructuredText
Limits
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------
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This page is documentation to the various fundamental size limits in
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the Pillow implementation.
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Internal Limits
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===============
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* Image sizes cannot be negative. These are checked both in
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``Storage.c`` and ``Image.py``
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* Image sizes may be 0. (At least, prior to 3.4)
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* Maximum pixel dimensions are limited to INT32, or 2^31 by the sizes
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in the image header.
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* Individual allocations are limited to 2GB in ``Storage.c``
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* The 2GB allocation puts an upper limit to the xsize of the image of
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either 2^31 for 'L' or 2^29 for 'RGB'
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* Individual memory mapped segments are limited to 2GB in map.c based
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on the overflow checks. This requires that any memory mapped image
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is smaller than 2GB, as calculated by ``y*stride`` (so 2Gpx for 'L'
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images, and .5Gpx for 'RGB'
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* Any call to internal python size functions for buffers or strings
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are currently returned as int32, not py_ssize_t. This limits the
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maximum buffer to 2GB for operations like frombytes and frombuffer.
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* This also limits the size of buffers converted using a
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decoder. (decode.c:127)
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Format Size Limits
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==================
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* ICO: Max size is 256x256
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* Webp: 16383x16383 (underlying library size limit:
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https://developers.google.com/speed/webp/docs/api)
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