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38  <div class="navpath"><a class="el" href="namespaceboost.html">boost</a>::<b>gil</b>::<a class="el" href="g_i_l_0264.html">ChannelConcept</a>
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41<h1>ChannelConcept Struct Template Reference<br>
42<small>
43[<a class="el" href="g_i_l_0098.html">Concepts</a>]</small>
44</h1><!-- doxytag: class="boost::gil::ChannelConcept" --><code>#include &lt;<a class="el" href="g_i_l_0091.html">gil_concept.hpp</a>&gt;</code>
45<p>
46
47<p>
48<a href="g_i_l_0263.html">List of all members.</a><hr><a name="_details"></a><h2>Detailed Description</h2>
49<h3>template&lt;typename T&gt;<br>
50 struct boost::gil::ChannelConcept&lt; T &gt;</h3>
51
52A channel is the building block of a color. Color is defined as a mixture of primary colors and a channel defines the degree to which each primary color is used in the mixture. 
53<p>
54Channel CONCEPTS For example, in the RGB color space, using 8-bit unsigned channels, the color red is defined as [255 0 0], which means maximum of Red, and no Green and Blue.<p>
55Built-in scalar types, such as <code>int</code> and <code>float</code>, are valid GIL channels. In more complex scenarios, channels may be represented as bit ranges or even individual bits. In such cases special classes are needed to represent the value and reference to a channel.<p>
56Channels have a traits class, <code><a class="el" href="g_i_l_0429.html" title="Traits for channels. Contains the following members:.">channel_traits</a></code>, which defines their associated types as well as their operating ranges.<p>
57<div class="fragment"><pre class="fragment">concept ChannelConcept&lt;typename T&gt; : EqualityComparable&lt;T&gt; {
58    <span class="keyword">typename</span> value_type      = T;        <span class="comment">// use channel_traits&lt;T&gt;::value_type to access it</span>
59    <span class="keyword">typename</span> reference       = T&amp;;       <span class="comment">// use channel_traits&lt;T&gt;::reference to access it</span>
60    <span class="keyword">typename</span> pointer         = T*;       <span class="comment">// use channel_traits&lt;T&gt;::pointer to access it</span>
61    <span class="keyword">typename</span> const_reference = <span class="keyword">const</span> T&amp;; <span class="comment">// use channel_traits&lt;T&gt;::const_reference to access it</span>
62    <span class="keyword">typename</span> const_pointer   = <span class="keyword">const</span> T*; <span class="comment">// use channel_traits&lt;T&gt;::const_pointer to access it</span>
63    <span class="keyword">static</span> <span class="keyword">const</span> <span class="keywordtype">bool</span> is_mutable;        <span class="comment">// use channel_traits&lt;T&gt;::is_mutable to access it</span>
64
65    <span class="keyword">static</span> T min_value();                <span class="comment">// use channel_traits&lt;T&gt;::min_value to access it</span>
66    <span class="keyword">static</span> T max_value();                <span class="comment">// use channel_traits&lt;T&gt;::min_value to access it</span>
67};
68</pre></div> <table border="0" cellpadding="0" cellspacing="0">
69<tr><td></td></tr>
70<tr><td colspan="2"><br><h2>Public Member Functions</h2></td></tr>
71<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="b0a0dbf6ca9028bbbb2240cad5882537"></a><!-- doxytag: member="boost::gil::ChannelConcept::constraints" ref="b0a0dbf6ca9028bbbb2240cad5882537" args="()" -->
72void&nbsp;</td><td class="memItemRight" valign="bottom"><b>constraints</b> ()</td></tr>
73
74<tr><td colspan="2"><br><h2>Public Attributes</h2></td></tr>
75<tr><td class="memItemLeft" nowrap align="right" valign="top"><a class="anchor" name="169228264adc1071b8585ae0c7f390cd"></a><!-- doxytag: member="boost::gil::ChannelConcept::c" ref="169228264adc1071b8585ae0c7f390cd" args="" -->
76T&nbsp;</td><td class="memItemRight" valign="bottom"><b>c</b></td></tr>
77
78</table>
79<hr>The documentation for this struct was generated from the following file:<ul>
80<li><a class="el" href="g_i_l_0091.html">gil_concept.hpp</a></ul>
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