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><head><title>glGetColorTable</title><link rel="stylesheet" href="style.css" type="text/css"/><meta name="generator" content="DocBook XSL Stylesheets V1.59.1"/><link rel="home" href="index.xml" title="PyOpenGL 2.0.1.07 Man Pages"/><link rel="up" href="reference-GL.xml" title="GL"/><link rel="previous" href="glGetClipPlane.3G.xml" title="glGetClipPlane"/><link rel="next" href="glGetColorTableParameter.3G.xml" title="glGetColorTableParameter"/></head><body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">glGetColorTable</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="glGetClipPlane.3G.xml">Prev</a> </td><th width="60%" align="center">GL</th><td width="20%" align="right"> <a accesskey="n" href="glGetColorTableParameter.3G.xml">Next</a></td></tr></table><hr/></div><div class="refentry" lang="en"><a name="glGetColorTable.3G"/><div class="titlepage"/><div class="refnamediv"><a name="glGetColorTable.3G-name"/><h2>Name</h2><p>glGetColorTable &#8212; retrieve contents of a color lookup table</p></div><div class="refsynopsisdiv"><a name="glGetColorTable.3G-c_spec"/><h2>C Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code>void <tt>glGetColorTable</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code>GLenum <i><tt>target</tt></i>, GLenum <i><tt>format</tt></i>, GLenum <i><tt>type</tt></i>, GLvoid *<i><tt>table</tt></i>);</code></td></tr></table></div><div class="refsynopsisdiv"><a name="glGetColorTable.3G-python_spec"/><h2>Python Specification</h2><table class="funcprototype" border="0" cellpadding="0" cellspacing="0"><tr><td valign="top"><code><tt>glGetColorTable</tt></code></td><td valign="top"><code>(</code></td><td valign="top"><code><i><tt>target</tt></i>, <i><tt>format</tt></i>, <i><tt>type</tt></i>, <i><tt>table</tt></i>) &#8594; <tt>None</tt></code></td></tr></table></div><div class="refsect1" lang="en"><a name="glGetColorTable.3G-parameters"/><h2>Parameters</h2><div class="variablelist"><dl><dt><span class="term"><i><tt>target</tt></i></span></dt><dd>
						Must be <tt>GL_COLOR_TABLE</tt>, <tt>GL_POST_CONVOLUTION_COLOR_TABLE</tt>, or
						<tt>GL_POST_COLOR_MATRIX_COLOR_TABLE</tt>.
					</dd><dt><span class="term"><i><tt>format</tt></i></span></dt><dd>
						The of the pixel data in <i><tt>table</tt></i>. The possible values are <tt>GL_RED</tt>,
						<tt>GL_GREEN</tt>, <tt>GL_BLUE</tt>, <tt>GL_ALPHA</tt>,
						<tt>GL_LUMINANCE</tt>, <tt>GL_LUMINANCE_ALPHA</tt>, <tt>GL_RGB</tt>,
						<tt>GL_BGR</tt>, <tt>GL_RGBA</tt>, and <tt>GL_BGRA</tt>.
					</dd><dt><span class="term"><i><tt>type</tt></i></span></dt><dd>
						The type of the pixel data in <i><tt>table</tt></i>. Symbolic constants
						<tt>GL_UNSIGNED_BYTE</tt>, <tt>GL_BYTE</tt>, <tt>GL_BITMAP</tt>,
						<tt>GL_UNSIGNED_SHORT</tt>, <tt>GL_SHORT</tt>,
						<tt>GL_UNSIGNED_INT</tt>, <tt>GL_INT</tt>, <tt>GL_FLOAT</tt>,
						<tt>GL_UNSIGNED_BYTE_3_3_2</tt>, <tt>GL_UNSIGNED_BYTE_2_3_3_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_5_6_5</tt>, <tt>GL_UNSIGNED_SHORT_5_6_5_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_4_4_4_4</tt>, <tt>GL_UNSIGNED_SHORT_4_4_4_4_REV</tt>,
						<tt>GL_UNSIGNED_SHORT_5_5_5_1</tt>, <tt>GL_UNSIGNED_SHORT_1_5_5_5_REV</tt>,
						<tt>GL_UNSIGNED_INT_8_8_8_8</tt>, <tt>GL_UNSIGNED_INT_8_8_8_8_REV</tt>,
						<tt>GL_UNSIGNED_INT_10_10_10_2</tt>, and <tt>GL_UNSIGNED_INT_2_10_10_10_REV</tt>
						are accepted.
					</dd><dt><span class="term"><i><tt>table</tt></i></span></dt><dd>
						Pointer to a one-dimensional array of pixel data containing the contents of the color table.
					</dd></dl></div></div><div class="refsect1" lang="en"><a name="glGetColorTable.3G-description"/><h2>Description</h2><p>
			<tt>glGetColorTable</tt> returns in <i><tt>table</tt></i> the contents of the color table specified
			by <i><tt>target</tt></i>. No pixel transfer operations are performed, but pixel storage modes that are
			applicable to <a href="glReadPixels.3G.xml"><tt>glReadPixels</tt></a> are performed.
		</p><p>
			Color components that are requested in the specified <i><tt>format</tt></i>, but which are not included in the
			internal of the color lookup table, are returned as zero. The assignments of internal color components to the
			components requested by <i><tt>format</tt></i> are
		</p><div class="informaltable"><table border="1"><colgroup><col/><col/></colgroup><tbody><tr><td><span class="bold"><b>Internal Component</b></span></td><td><span class="bold"><b>Resulting Component</b></span></td></tr><tr><td>red</td><td>red</td></tr><tr><td>green</td><td>green</td></tr><tr><td>blue</td><td>blue</td></tr><tr><td>alpha</td><td>alpha</td></tr><tr><td>luminance</td><td>red</td></tr><tr><td>intensity</td><td>red</td></tr></tbody></table></div></div><div class="refsect1" lang="en"><a name="glGetColorTable.3G-notes"/><h2>Notes</h2><p>
			<tt>glGetColorTable</tt> is present only if <tt>GL_ARB_imaging</tt> is returned when <a href="glGetString.3G.xml"><tt>glGetString</tt></a> is called with an argument of <tt>GL_EXTENSIONS</tt>.
		</p></div><div class="refsect1" lang="en"><a name="glGetColorTable.3G-errors"/><h2>Errors</h2><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>target</tt></i> is not one of the allowable values.
		</p><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>format</tt></i> is not one of the allowable values.
		</p><p>
			<tt>GL_INVALID_ENUM</tt> is generated if <i><tt>type</tt></i> is not one of the allowable values.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <i><tt>type</tt></i> is one of
			<tt>GL_UNSIGNED_BYTE_3_3_2</tt>, <tt>GL_UNSIGNED_BYTE_2_3_3_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_6_5</tt>, or <tt>GL_UNSIGNED_SHORT_5_6_5_REV</tt> and
			<i><tt>format</tt></i> is not <tt>GL_RGB</tt>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <i><tt>type</tt></i> is one of
			<tt>GL_UNSIGNED_SHORT_4_4_4_4</tt>, <tt>GL_UNSIGNED_SHORT_4_4_4_4_REV</tt>,
			<tt>GL_UNSIGNED_SHORT_5_5_5_1</tt>, <tt>GL_UNSIGNED_SHORT_1_5_5_5_REV</tt>,
			<tt>GL_UNSIGNED_INT_8_8_8_8</tt>, <tt>GL_UNSIGNED_INT_8_8_8_8_REV</tt>,
			<tt>GL_UNSIGNED_INT_10_10_10_2</tt>, or <tt>GL_UNSIGNED_INT_2_10_10_10_REV</tt> and
			<i><tt>format</tt></i> is neither <tt>GL_RGBA</tt> nor <tt>GL_BGRA</tt>.
		</p><p>
			<tt>GL_INVALID_OPERATION</tt> is generated if <tt>glGetColorTable</tt> is executed between the
			execution of <a href="glBegin.3G.xml"><tt>glBegin</tt></a> and the corresponding execution of <a href="glBegin.3G.xml"><tt>glEnd</tt></a>.
		</p></div><div class="refsect1" lang="en"><a name="glGetColorTable.3G-see_also"/><h2>See Also</h2><p>
			<span class="simplelist"><a href="glColorTable.3G.xml">glColorTable</a>, <a href="glColorTableParameter.3G.xml">glColorTableParameter</a>, <a href="glGetColorTableParameter.3G.xml">glGetColorTableParameter</a></span>
		</p></div></div><div class="navfooter"><hr/><table width="100%" summary="Navigation footer"><tr><td width="40%" align="left"><a accesskey="p" href="glGetClipPlane.3G.xml">Prev</a> </td><td width="20%" align="center"><a accesskey="u" href="reference-GL.xml">Up</a></td><td width="40%" align="right"> <a accesskey="n" href="glGetColorTableParameter.3G.xml">Next</a></td></tr><tr><td width="40%" align="left" valign="top">glGetClipPlane </td><td width="20%" align="center"><a accesskey="h" href="index.xml">Home</a></td><td width="40%" align="right" valign="top"> glGetColorTableParameter</td></tr></table></div></body></html>