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<li class="toctree-l4"><a class="reference internal" href="#internal-limits">Internal Limits</a></li>
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<div class="section" id="limits">
<h1>Limits<a class="headerlink" href="#limits" title="Permalink to this headline">¶</a></h1>
<p>This page is documentation to the various fundamental size limits in
the Pillow implementation.</p>
<div class="section" id="internal-limits">
<h2>Internal Limits<a class="headerlink" href="#internal-limits" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>Image sizes cannot be negative. These are checked both in
<code class="docutils literal notranslate"><span class="pre">Storage.c</span></code> and <code class="docutils literal notranslate"><span class="pre">Image.py</span></code></li>
<li>Image sizes may be 0. (Although not in 3.4)</li>
<li>Maximum pixel dimensions are limited to INT32, or 2^31 by the sizes
in the image header.</li>
<li>Individual allocations are limited to 2GB in <code class="docutils literal notranslate"><span class="pre">Storage.c</span></code></li>
<li>The 2GB allocation puts an upper limit to the xsize of the image of
either 2^31 for ‘L’ or 2^29 for ‘RGB’</li>
<li>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 <code class="docutils literal notranslate"><span class="pre">y*stride</span></code> (so 2Gpx for ‘L’
images, and .5Gpx for ‘RGB’</li>
<li>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.</li>
<li>This also limits the size of buffers converted using a
decoder. (decode.c:127)</li>
</ul>
</div>
<div class="section" id="format-size-limits">
<h2>Format Size Limits<a class="headerlink" href="#format-size-limits" title="Permalink to this headline">¶</a></h2>
<ul class="simple">
<li>ICO: Max size is 256x256</li>
<li>Webp: 16383x16383 (underlying library size limit:
<a class="reference external" href="https://developers.google.com/speed/webp/docs/api">https://developers.google.com/speed/webp/docs/api</a>)</li>
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