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<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /><meta name="generator" content="Docutils 0.17.1: http://docutils.sourceforge.net/" /> <title>21.8. imghdr — Determine the type of an image — Python 2.7.18 documentation</title> <link rel="stylesheet" type="text/css" href="../_static/pygments.css" /> <link rel="stylesheet" type="text/css" href="../_static/classic.css" /> <script data-url_root="../" id="documentation_options" src="../_static/documentation_options.js"></script> <script src="../_static/jquery.js"></script> <script src="../_static/underscore.js"></script> <script src="../_static/doctools.js"></script> <script src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.18 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="index" title="Index" href="../genindex.html" /> <link rel="search" title="Search" href="../search.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="next" title="21.9. sndhdr — Determine type of sound file" href="sndhdr.html" /> <link rel="prev" title="21.7. colorsys — Conversions between color systems" href="colorsys.html" /> <link rel="shortcut icon" type="image/png" href="../_static/py.png" /> <link rel="canonical" href="file:///usr/share/doc/python2.7/html/library/imghdr.html" /> <script type="text/javascript" src="../_static/copybutton.js"></script> </head><body> <div id="outdated-warning" style="padding: .5em; text-align: center; background-color: #FFBABA; color: #6A0E0E;"> This document is for an old version of Python that is <a href="https://devguide.python.org/devcycle/#end-of-life-branches">no longer supported</a>. You should install the python3 and python3-doc packages and read the <a href="file:///usr/share/doc/python3-doc/html/library/imghdr.html"> Python documentation for the Python3 version packaged in this release</a>. </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" accesskey="I">index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="sndhdr.html" title="21.9. sndhdr — Determine type of sound file" accesskey="N">next</a> |</li> <li class="right" > <a href="colorsys.html" title="21.7. colorsys — Conversions between color systems" accesskey="P">previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" accesskey="U"><span class="section-number">21. </span>Multimedia Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><span class="section-number">21.8. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code> — Determine the type of an image</a></li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body" role="main"> <section id="module-imghdr"> <span id="imghdr-determine-the-type-of-an-image"></span><h1><span class="section-number">21.8. </span><a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream."><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="Permalink to this headline">¶</a></h1> <p><strong>Source code:</strong> <a class="reference external" href="https://github.com/python/cpython/tree/2.7/Lib/imghdr.py">Lib/imghdr.py</a></p> <hr class="docutils" /> <p>The <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream."><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 byte stream.</p> <p>The <a class="reference internal" href="#module-imghdr" title="imghdr: Determine the type of image contained in a file or byte stream."><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> module defines the following function:</p> <dl class="py function"> <dt class="sig sig-object py" id="imghdr.what"> <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">filename</span></span></em><span class="optional">[</span>, <em class="sig-param"><span class="n"><span class="pre">h</span></span></em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#imghdr.what" title="Permalink to this definition">¶</a></dt> <dd><p>Tests the image data contained in the file named by <em>filename</em>, and returns a string describing the image type. If optional <em>h</em> is provided, the <em>filename</em> is ignored and <em>h</em> is assumed to contain the byte stream to test.</p> </dd></dl> <p>The following image types are recognized, as listed below with the return value 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> <table class="docutils align-default"> <colgroup> <col style="width: 26%" /> <col style="width: 74%" /> </colgroup> <thead> <tr class="row-odd"><th class="head"><p>Value</p></th> <th class="head"><p>Image format</p></th> </tr> </thead> <tbody> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'rgb'</span></code></p></td> <td><p>SGI ImgLib Files</p></td> </tr> <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'gif'</span></code></p></td> <td><p>GIF 87a and 89a Files</p></td> </tr> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'pbm'</span></code></p></td> <td><p>Portable Bitmap Files</p></td> </tr> <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'pgm'</span></code></p></td> <td><p>Portable Graymap Files</p></td> </tr> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'ppm'</span></code></p></td> <td><p>Portable Pixmap Files</p></td> </tr> <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'tiff'</span></code></p></td> <td><p>TIFF Files</p></td> </tr> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'rast'</span></code></p></td> <td><p>Sun Raster Files</p></td> </tr> <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'xbm'</span></code></p></td> <td><p>X Bitmap Files</p></td> </tr> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'jpeg'</span></code></p></td> <td><p>JPEG data in JFIF or Exif formats</p></td> </tr> <tr class="row-odd"><td><p><code class="docutils literal notranslate"><span class="pre">'bmp'</span></code></p></td> <td><p>BMP files</p></td> </tr> <tr class="row-even"><td><p><code class="docutils literal notranslate"><span class="pre">'png'</span></code></p></td> <td><p>Portable Network Graphics</p></td> </tr> </tbody> </table> <div class="versionadded"> <p><span class="versionmodified added">New in version 2.5: </span>Exif detection.</p> </div> <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."><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code></a> can recognize by appending to this variable:</p> <dl class="py data"> <dt class="sig sig-object py" id="imghdr.tests"> <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="Permalink to this definition">¶</a></dt> <dd><p>A list of functions performing the individual tests. Each function takes two 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 called with a byte-stream, the file-like object will be <code class="docutils literal notranslate"><span class="pre">None</span></code>.</p> <p>The test function should return a string describing the image type if the test succeeded, or <code class="docutils literal notranslate"><span class="pre">None</span></code> if it failed.</p> </dd></dl> <p>Example:</p> <div class="highlight-default notranslate"><div class="highlight"><pre><span></span><span class="gp">>>> </span><span class="kn">import</span> <span class="nn">imghdr</span> <span class="gp">>>> </span><span class="n">imghdr</span><span class="o">.</span><span class="n">what</span><span class="p">(</span><span class="s1">'bass.gif'</span><span class="p">)</span> <span class="go">'gif'</span> </pre></div> </div> </section> <div class="clearer"></div> </div> </div> </div> <div class="sphinxsidebar" role="navigation" aria-label="main navigation"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="colorsys.html" title="previous chapter"><span class="section-number">21.7. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">colorsys</span></code> — Conversions between color systems</a></p> <h4>Next topic</h4> <p class="topless"><a href="sndhdr.html" title="next chapter"><span class="section-number">21.9. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">sndhdr</span></code> — Determine type of sound file</a></p> <div role="note" aria-label="source link"> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../_sources/library/imghdr.rst.txt" rel="nofollow">Show Source</a></li> </ul> </div> <div id="searchbox" style="display: none" role="search"> <h3 id="searchlabel">Quick search</h3> <div class="searchformwrapper"> <form class="search" action="../search.html" method="get"> <input type="text" name="q" aria-labelledby="searchlabel" autocomplete="off" autocorrect="off" autocapitalize="off" spellcheck="false"/> <input type="submit" value="Go" /> </form> </div> </div> <script>$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related" role="navigation" aria-label="related navigation"> <h3>Navigation</h3> <ul> <li class="right" style="margin-right: 10px"> <a href="../genindex.html" title="General Index" >index</a></li> <li class="right" > <a href="../py-modindex.html" title="Python Module Index" >modules</a> |</li> <li class="right" > <a href="sndhdr.html" title="21.9. sndhdr — Determine type of sound file" >next</a> |</li> <li class="right" > <a href="colorsys.html" title="21.7. colorsys — Conversions between color systems" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="https://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.18 documentation</a> » </li> <li class="nav-item nav-item-1"><a href="index.html" >The Python Standard Library</a> »</li> <li class="nav-item nav-item-2"><a href="mm.html" ><span class="section-number">21. </span>Multimedia Services</a> »</li> <li class="nav-item nav-item-this"><a href=""><span class="section-number">21.8. </span><code class="xref py py-mod docutils literal notranslate"><span class="pre">imghdr</span></code> — Determine the type of an image</a></li> </ul> </div> <div class="footer"> © <a href="../copyright.html">Copyright</a> 1990-2024, Python Software Foundation. <br /> The Python Software Foundation is a non-profit corporation. <a href="https://www.python.org/psf/donations/">Please donate.</a> <br /> Last updated on November 21, 2024. <a href="../bugs.html">Found a bug</a>? <br /> Created using <a href="http://sphinx.pocoo.org/">Sphinx</a> 4.3.2. </div> </body> </html>