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<h2>Thumbnails creation</h2>
<p>This page let you create missing thumbnails. It is advised not to use this functionality if your gallery is hosted on a shared server.</p>
<dl>
<dt>GD version</dt>
<dd>GD is the picture manipulating library for PHP. Choose the version
installed on your server. You will be warned by an error message, should you choose the wrong one; just come back to the previous page with your browser and choose the other version. If no
version works, then your server does not support GD.</dd>
<dt>Width and height</dt>
<dd>Maximum thumbnails dimensions. Original aspect ratio is
preserved. Default values can be modified using configuration settings <code>tn_width</code> and
<code>tn_height</code> (see <span
class="filename">include/config_default.inc.php</span> file).</dd>
<dt>Number of thumbnails to create</dt>
<dd>Do not try to miniaturize too many photos at once. The miniaturization process does use a lot of CPU. If your Piwigo gallery is hosted by a free provider, too high CPU a load might lead to the withdrawal of your website.</dd>
<dt>File format</dt>
<dd>Thumbnails are created in JPEG file format. They
can be created from PNG and JPEG photos only.</dd>
</dl>
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