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| 54 | ||
| 55 | <H1><A NAME="SECTION0016800000000000000000"> | |
| 56 | 14.8 <tt class="module">rgbimg</tt> -- | |
| 57 | Read and write ``SGI RGB'' files</A> | |
| 58 | </H1> | |
| 59 | ||
| 60 | <P> | |
| 61 | <A NAME="module-rgbimg"></A> | |
| 62 | ||
| 63 | <P> | |
| 64 | The <tt class="module">rgbimg</tt> module allows Python programs to access SGI imglib image | |
| 65 | files (also known as <span class="file">.rgb</span> files). The module is far from | |
| 66 | complete, but is provided anyway since the functionality that there is | |
| 67 | enough in some cases. Currently, colormap files are not supported. | |
| 68 | ||
| 69 | <P> | |
| 70 | <span class="note"><b class="label">Note:</b> | |
| 71 | This module is only built by default for 32-bit platforms; it is | |
| 72 | not expected to work properly on other systems.</span> | |
| 73 | ||
| 74 | <P> | |
| 75 | The module defines the following variables and functions: | |
| 76 | ||
| 77 | <P> | |
| 78 | <dl><dt><b><span class="typelabel">exception</span> <tt id='l2h-4756' xml:id='l2h-4756' class="exception">error</tt></b></dt> | |
| 79 | <dd> | |
| 80 | This exception is raised on all errors, such as unsupported file type, etc. | |
| 81 | </dd></dl> | |
| 82 | ||
| 83 | <P> | |
| 84 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 85 | <td><nobr><b><tt id='l2h-4757' xml:id='l2h-4757' class="function">sizeofimage</tt></b>(</nobr></td> | |
| 86 | <td><var>file</var>)</td></tr></table></dt> | |
| 87 | <dd> | |
| 88 | This function returns a tuple <code>(<var>x</var>, <var>y</var>)</code> where | |
| 89 | <var>x</var> and <var>y</var> are the size of the image in pixels. | |
| 90 | Only 4 byte RGBA pixels, 3 byte RGB pixels, and 1 byte greyscale pixels | |
| 91 | are currently supported. | |
| 92 | </dl> | |
| 93 | ||
| 94 | <P> | |
| 95 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 96 | <td><nobr><b><tt id='l2h-4758' xml:id='l2h-4758' class="function">longimagedata</tt></b>(</nobr></td> | |
| 97 | <td><var>file</var>)</td></tr></table></dt> | |
| 98 | <dd> | |
| 99 | This function reads and decodes the image on the specified file, and | |
| 100 | returns it as a Python string. The string has 4 byte RGBA pixels. | |
| 101 | The bottom left pixel is the first in | |
| 102 | the string. This format is suitable to pass to <tt class="function">gl.lrectwrite()</tt>, | |
| 103 | for instance. | |
| 104 | </dl> | |
| 105 | ||
| 106 | <P> | |
| 107 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 108 | <td><nobr><b><tt id='l2h-4759' xml:id='l2h-4759' class="function">longstoimage</tt></b>(</nobr></td> | |
| 109 | <td><var>data, x, y, z, file</var>)</td></tr></table></dt> | |
| 110 | <dd> | |
| 111 | This function writes the RGBA data in <var>data</var> to image | |
| 112 | file <var>file</var>. <var>x</var> and <var>y</var> give the size of the image. | |
| 113 | <var>z</var> is 1 if the saved image should be 1 byte greyscale, 3 if the | |
| 114 | saved image should be 3 byte RGB data, or 4 if the saved images should | |
| 115 | be 4 byte RGBA data. The input data always contains 4 bytes per pixel. | |
| 116 | These are the formats returned by <tt class="function">gl.lrectread()</tt>. | |
| 117 | </dl> | |
| 118 | ||
| 119 | <P> | |
| 120 | <dl><dt><table cellpadding="0" cellspacing="0"><tr valign="baseline"> | |
| 121 | <td><nobr><b><tt id='l2h-4760' xml:id='l2h-4760' class="function">ttob</tt></b>(</nobr></td> | |
| 122 | <td><var>flag</var>)</td></tr></table></dt> | |
| 123 | <dd> | |
| 124 | This function sets a global flag which defines whether the scan lines | |
| 125 | of the image are read or written from bottom to top (flag is zero, | |
| 126 | compatible with SGI GL) or from top to bottom(flag is one, | |
| 127 | compatible with X). The default is zero. | |
| 128 | </dl> | |
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