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  183. <span id="imghdr-determine-the-type-of-an-image"></span><h1><a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> — Determine the type of an image<a class="headerlink" href="#module-imghdr" title="Link to this heading">¶</a></h1>

  184. <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/3.12/Lib/imghdr.py">Lib/imghdr.py</a></p>

  185. <div class="deprecated-removed">

  186. <p><span class="versionmodified">Deprecated since version 3.11, will be removed in version 3.13: </span>The <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> module is deprecated

  187. (see <span class="target" id="index-0"></span><a class="pep reference external" href="https://peps.python.org/pep-0594/#imghdr"><strong>PEP 594</strong></a> for details and alternatives).</p>

  188. </div>

  189. <hr class="docutils" />

  190. <p>The <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> module determines the type of image contained in a file or

  191. byte stream.</p>

  192. <p>The <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> module defines the following function:</p>

  193. <dl class="py function">

  194. <dt class="sig sig-object py" id="imghdr.what">

  195. <span class="sig-prename descclassname"><span class="pre">imghdr.</span></span><span class="sig-name descname"><span class="pre">what</span></span><span class="sig-paren">(</span><em class="sig-param"><span class="n"><span class="pre">file</span></span></em>, <em class="sig-param"><span class="n"><span class="pre">h</span></span><span class="o"><span class="pre">=</span></span><span class="default_value"><span class="pre">None</span></span></em><span class="sig-paren">)</span><a class="headerlink" href="#imghdr.what" title="Link to this definition">¶</a></dt>

  196. <dd><p>Test the image data contained in the file named <em>file</em> and return a

  197. string describing the image type.  If <em>h</em> is provided, the <em>file</em>

  198. argument is ignored and <em>h</em> is assumed to contain the byte stream to test.</p>

  199. <div class="versionchanged">

  200. <p><span class="versionmodified changed">Changed in version 3.6: </span>Accepts a <a class="reference internal" href="../glossary.html#term-path-like-object"><span class="xref std std-term">path-like object</span></a>.</p>

  201. </div>

  202. </dd></dl>

  203. 

  204. <p>The following image types are recognized, as listed below with the return value

  205. from <a class="reference internal" href="#imghdr.what" title="imghdr.what"><code class="xref py py-func docutils literal notranslate"><span class="pre">what()</span></code></a>:</p>

  206. <table class="docutils align-default">

  207. <thead>

  208. <tr class="row-odd"><th class="head"><p>Value</p></th>

  209. <th class="head"><p>Image format</p></th>

  210. </tr>

  211. </thead>

  212. <tbody>

  213. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'rgb'</span></code></p></td>

  214. <td><p>SGI ImgLib Files</p></td>

  215. </tr>

  216. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'gif'</span></code></p></td>

  217. <td><p>GIF 87a and 89a Files</p></td>

  218. </tr>

  219. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'pbm'</span></code></p></td>

  220. <td><p>Portable Bitmap Files</p></td>

  221. </tr>

  222. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'pgm'</span></code></p></td>

  223. <td><p>Portable Graymap Files</p></td>

  224. </tr>

  225. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'ppm'</span></code></p></td>

  226. <td><p>Portable Pixmap Files</p></td>

  227. </tr>

  228. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'tiff'</span></code></p></td>

  229. <td><p>TIFF Files</p></td>

  230. </tr>

  231. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'rast'</span></code></p></td>

  232. <td><p>Sun Raster Files</p></td>

  233. </tr>

  234. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'xbm'</span></code></p></td>

  235. <td><p>X Bitmap Files</p></td>

  236. </tr>

  237. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'jpeg'</span></code></p></td>

  238. <td><p>JPEG data in JFIF or Exif formats</p></td>

  239. </tr>

  240. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'bmp'</span></code></p></td>

  241. <td><p>BMP files</p></td>

  242. </tr>

  243. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'png'</span></code></p></td>

  244. <td><p>Portable Network Graphics</p></td>

  245. </tr>

  246. <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'webp'</span></code></p></td>

  247. <td><p>WebP files</p></td>

  248. </tr>

  249. <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'exr'</span></code></p></td>

  250. <td><p>OpenEXR Files</p></td>

  251. </tr>

  252. </tbody>

  253. </table>

  254. <div class="versionadded">

  255. <p><span class="versionmodified added">New in version 3.5: </span>The <em>exr</em> and <em>webp</em> formats were added.</p>

  256. </div>

  257. <p>You can extend the list of file types <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream. (deprecated)"><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> can recognize by appending

  258. to this variable:</p>

  259. <dl class="py data">

  260. <dt class="sig sig-object py" id="imghdr.tests">

  261. <span class="sig-prename descclassname"><span class="pre">imghdr.</span></span><span class="sig-name descname"><span class="pre">tests</span></span><a class="headerlink" href="#imghdr.tests" title="Link to this definition">¶</a></dt>

  262. <dd><p>A list of functions performing the individual tests.  Each function takes two

  263. arguments: the byte-stream and an open file-like object. When <a class="reference internal" href="#imghdr.what" title="imghdr.what"><code class="xref py py-func docutils literal notranslate"><span class="pre">what()</span></code></a> is

  264. called with a byte-stream, the file-like object will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p>

  265. <p>The test function should return a string describing the image type if the test

  266. succeeded, or <code class="docutils literal notranslate"><span class="pre">None</span></code> if it failed.</p>

  267. </dd></dl>

  268. 

  269. <p>Example:</p>

  270. <div class="highlight-python3 notranslate"><div class="highlight"><pre><span></span><span class="gp">&gt;&gt;&gt; </span><span class="kn">import</span> <span class="nn">imghdr</span>

  271. <span class="gp">&gt;&gt;&gt; </span><span class="n">imghdr</span><span class="o">.</span><span class="n">what</span><span class="p">(</span><span class="s1">&#39;bass.gif&#39;</span><span class="p">)</span>

  272. <span class="go">&#39;gif&#39;</span>

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  380.     <br />

  381.     

  382.       See <a href="/license.html">History and License</a> for more information.<br />

  383.     

  384.     

  385.     <br />

  386. 

  387.     The Python Software Foundation is a non-profit corporation.

  388. <a href="https://www.python.org/psf/donations/">Please donate.</a>

  389. <br />

  390.     <br />

  391.       Last updated on Apr 09, 2024 (13:47 UTC).

  392.     

  393.       <a href="/bugs.html">Found a bug</a>?

  394.     

  395.     <br />

  396. 

  397.     Created using <a href="https://www.sphinx-doc.org/">Sphinx</a> 7.2.6.

  398.     </div>

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