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