Edit File: imgfile.html
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <title>38.11. imgfile — Support for SGI imglib files — Python 2.7.5 documentation</title> <link rel="stylesheet" href="../_static/default.css" type="text/css" /> <link rel="stylesheet" href="../_static/pygments.css" type="text/css" /> <script type="text/javascript"> var DOCUMENTATION_OPTIONS = { URL_ROOT: '../', VERSION: '2.7.5', COLLAPSE_INDEX: false, FILE_SUFFIX: '.html', HAS_SOURCE: true }; </script> <script type="text/javascript" src="../_static/jquery.js"></script> <script type="text/javascript" src="../_static/underscore.js"></script> <script type="text/javascript" src="../_static/doctools.js"></script> <script type="text/javascript" src="../_static/sidebar.js"></script> <link rel="search" type="application/opensearchdescription+xml" title="Search within Python 2.7.5 documentation" href="../_static/opensearch.xml"/> <link rel="author" title="About these documents" href="../about.html" /> <link rel="copyright" title="Copyright" href="../copyright.html" /> <link rel="top" title="Python 2.7.5 documentation" href="../index.html" /> <link rel="up" title="38. 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SGI IRIX Specific Services</a> »</li> </ul> </div> <div class="document"> <div class="documentwrapper"> <div class="bodywrapper"> <div class="body"> <div class="section" id="module-imgfile"> <span id="imgfile-support-for-sgi-imglib-files"></span><h1>38.11. <a class="reference internal" href="#module-imgfile" title="imgfile: Support for SGI imglib files. (deprecated) (IRIX)"><tt class="xref py py-mod docutils literal"><span class="pre">imgfile</span></tt></a> — Support for SGI imglib files<a class="headerlink" href="#module-imgfile" title="Permalink to this headline">¶</a></h1> <p class="deprecated"> <span class="versionmodified">Deprecated since version 2.6: </span>The <a class="reference internal" href="#module-imgfile" title="imgfile: Support for SGI imglib files. (deprecated) (IRIX)"><tt class="xref py py-mod docutils literal"><span class="pre">imgfile</span></tt></a> module has been removed in Python 3.</p> <p>The <a class="reference internal" href="#module-imgfile" title="imgfile: Support for SGI imglib files. (deprecated) (IRIX)"><tt class="xref py py-mod docutils literal"><span class="pre">imgfile</span></tt></a> module allows Python programs to access SGI imglib image files (also known as <tt class="file docutils literal"><span class="pre">.rgb</span></tt> files). The module is far from complete, but is provided anyway since the functionality that there is enough in some cases. Currently, colormap files are not supported.</p> <p>The module defines the following variables and functions:</p> <dl class="exception"> <dt id="imgfile.error"> <em class="property">exception </em><tt class="descclassname">imgfile.</tt><tt class="descname">error</tt><a class="headerlink" href="#imgfile.error" title="Permalink to this definition">¶</a></dt> <dd><p>This exception is raised on all errors, such as unsupported file type, etc.</p> </dd></dl> <dl class="function"> <dt id="imgfile.getsizes"> <tt class="descclassname">imgfile.</tt><tt class="descname">getsizes</tt><big>(</big><em>file</em><big>)</big><a class="headerlink" href="#imgfile.getsizes" title="Permalink to this definition">¶</a></dt> <dd><p>This function returns a tuple <tt class="docutils literal"><span class="pre">(x,</span> <span class="pre">y,</span> <span class="pre">z)</span></tt> where <em>x</em> and <em>y</em> are the size of the image in pixels and <em>z</em> is the number of bytes per pixel. Only 3 byte RGB pixels and 1 byte greyscale pixels are currently supported.</p> </dd></dl> <dl class="function"> <dt id="imgfile.read"> <tt class="descclassname">imgfile.</tt><tt class="descname">read</tt><big>(</big><em>file</em><big>)</big><a class="headerlink" href="#imgfile.read" title="Permalink to this definition">¶</a></dt> <dd><p>This function reads and decodes the image on the specified file, and returns it as a Python string. The string has either 1 byte greyscale pixels or 4 byte RGBA pixels. The bottom left pixel is the first in the string. This format is suitable to pass to <tt class="xref py py-func docutils literal"><span class="pre">gl.lrectwrite()</span></tt>, for instance.</p> </dd></dl> <dl class="function"> <dt id="imgfile.readscaled"> <tt class="descclassname">imgfile.</tt><tt class="descname">readscaled</tt><big>(</big><em>file</em>, <em>x</em>, <em>y</em>, <em>filter</em><span class="optional">[</span>, <em>blur</em><span class="optional">]</span><big>)</big><a class="headerlink" href="#imgfile.readscaled" title="Permalink to this definition">¶</a></dt> <dd><p>This function is identical to read but it returns an image that is scaled to the given <em>x</em> and <em>y</em> sizes. If the <em>filter</em> and <em>blur</em> parameters are omitted scaling is done by simply dropping or duplicating pixels, so the result will be less than perfect, especially for computer-generated images.</p> <p>Alternatively, you can specify a filter to use to smooth the image after scaling. The filter forms supported are <tt class="docutils literal"><span class="pre">'impulse'</span></tt>, <tt class="docutils literal"><span class="pre">'box'</span></tt>, <tt class="docutils literal"><span class="pre">'triangle'</span></tt>, <tt class="docutils literal"><span class="pre">'quadratic'</span></tt> and <tt class="docutils literal"><span class="pre">'gaussian'</span></tt>. If a filter is specified <em>blur</em> is an optional parameter specifying the blurriness of the filter. It defaults to <tt class="docutils literal"><span class="pre">1.0</span></tt>.</p> <p><a class="reference internal" href="#imgfile.readscaled" title="imgfile.readscaled"><tt class="xref py py-func docutils literal"><span class="pre">readscaled()</span></tt></a> makes no attempt to keep the aspect ratio correct, so that is the users’ responsibility.</p> </dd></dl> <dl class="function"> <dt id="imgfile.ttob"> <tt class="descclassname">imgfile.</tt><tt class="descname">ttob</tt><big>(</big><em>flag</em><big>)</big><a class="headerlink" href="#imgfile.ttob" title="Permalink to this definition">¶</a></dt> <dd><p>This function sets a global flag which defines whether the scan lines of the image are read or written from bottom to top (flag is zero, compatible with SGI GL) or from top to bottom(flag is one, compatible with X). The default is zero.</p> </dd></dl> <dl class="function"> <dt id="imgfile.write"> <tt class="descclassname">imgfile.</tt><tt class="descname">write</tt><big>(</big><em>file</em>, <em>data</em>, <em>x</em>, <em>y</em>, <em>z</em><big>)</big><a class="headerlink" href="#imgfile.write" title="Permalink to this definition">¶</a></dt> <dd><p>This function writes the RGB or greyscale data in <em>data</em> to image file <em>file</em>. <em>x</em> and <em>y</em> give the size of the image, <em>z</em> is 1 for 1 byte greyscale images or 3 for RGB images (which are stored as 4 byte values of which only the lower three bytes are used). These are the formats returned by <tt class="xref py py-func docutils literal"><span class="pre">gl.lrectread()</span></tt>.</p> </dd></dl> </div> </div> </div> </div> <div class="sphinxsidebar"> <div class="sphinxsidebarwrapper"> <h4>Previous topic</h4> <p class="topless"><a href="gl.html" title="previous chapter">38.8. <tt class="docutils literal"><span class="pre">gl</span></tt> — <em>Graphics Library</em> interface</a></p> <h4>Next topic</h4> <p class="topless"><a href="jpeg.html" title="next chapter">38.12. <tt class="docutils literal"><span class="pre">jpeg</span></tt> — Read and write JPEG files</a></p> <h3>This Page</h3> <ul class="this-page-menu"> <li><a href="../bugs.html">Report a Bug</a></li> <li><a href="../_sources/library/imgfile.txt" rel="nofollow">Show Source</a></li> </ul> <div id="searchbox" style="display: none"> <h3>Quick search</h3> <form class="search" action="../search.html" method="get"> <input type="text" name="q" /> <input type="submit" value="Go" /> <input type="hidden" name="check_keywords" value="yes" /> <input type="hidden" name="area" value="default" /> </form> <p class="searchtip" style="font-size: 90%"> Enter search terms or a module, class or function name. </p> </div> <script type="text/javascript">$('#searchbox').show(0);</script> </div> </div> <div class="clearer"></div> </div> <div class="related"> <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="jpeg.html" title="38.12. jpeg — Read and write JPEG files" >next</a> |</li> <li class="right" > <a href="gl.html" title="38.8. gl — Graphics Library interface" >previous</a> |</li> <li><img src="../_static/py.png" alt="" style="vertical-align: middle; margin-top: -1px"/></li> <li><a href="http://www.python.org/">Python</a> »</li> <li> <a href="../index.html">Python 2.7.5 documentation</a> » </li> <li><a href="index.html" >The Python Standard Library</a> »</li> <li><a href="sgi.html" >38. 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