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<div class="section" id="id1">
<h1>3.3.0<a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h1>
<div class="section" id="libimagequant-support">
<h2>Libimagequant support<a class="headerlink" href="#libimagequant-support" title="Permalink to this headline">¶</a></h2>
<p>There is now support for using libimagequant as a higher quality
quantization option in <code class="docutils literal notranslate"><span class="pre">Image.quantize()</span></code> on Unix-like
platforms. This support requires building Pillow from source against
libimagequant. We cannot distribute binaries due to licensing
differences.</p>
</div>
<div class="section" id="new-setup-py-options">
<h2>New Setup.py options<a class="headerlink" href="#new-setup-py-options" title="Permalink to this headline">¶</a></h2>
<p>There are two new options to control the <code class="docutils literal notranslate"><span class="pre">build_ext</span></code> task in <code class="docutils literal notranslate"><span class="pre">setup.py</span></code>:</p>
<blockquote>
<div><ul class="simple">
<li><code class="docutils literal notranslate"><span class="pre">--debug</span></code> dumps all of the directories and files that are
checked when searching for libraries or headers when building the
extensions.</li>
<li><code class="docutils literal notranslate"><span class="pre">--disable-platform-guessing</span></code> removes many of the directories
that are checked for libraries and headers for build systems or
cross compilers that specify that information in via environment
variables.</li>
</ul>
</div></blockquote>
</div>
<div class="section" id="resizing">
<h2>Resizing<a class="headerlink" href="#resizing" title="Permalink to this headline">¶</a></h2>
<p>Image resampling for 8-bit per channel images was rewritten using only integer
computings. This is faster on most platforms and doesn’t introduce precision
errors on the wide range of scales. With other performance improvements, this
makes resampling 60% faster on average.</p>
<p>Color calculation for images in the <code class="docutils literal notranslate"><span class="pre">LA</span></code> mode on semitransparent pixels
was fixed.</p>
</div>
<div class="section" id="rotation">
<h2>Rotation<a class="headerlink" href="#rotation" title="Permalink to this headline">¶</a></h2>
<p>Rotation for angles divisible by 90 degrees now always uses transposition.
This greatly improves both quality and performance in this case.
Also, the bug with wrong image size calculation when rotating by 90 degrees
was fixed.</p>
</div>
<div class="section" id="image-metadata">
<h2>Image Metadata<a class="headerlink" href="#image-metadata" title="Permalink to this headline">¶</a></h2>
<p>The return type for binary data in version 2 Exif and Tiff metadata
has been changed from a tuple of integers to bytes. This is a change
from the behavior since <code class="docutils literal notranslate"><span class="pre">3.0.0</span></code>.</p>
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