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</style>
    <title>write_image (2D)</title>
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  <body>
    <div class="refentry">
      <a id="idp43332912"></a>
      <div class="titlepage"></div>
      <div xmlns="" class="refnamediv">
        <a xmlns="http://www.w3.org/1999/xhtml" id="write_image2d"></a>
        <h1>write_image</h1>
        <p>
            Write <code xmlns="http://www.w3.org/1999/xhtml" class="varname">color</code> value to location in a 2D image object.
        </p>
      </div>
      <div class="refsynopsisdiv">
        <h2></h2>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imagef
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imagef
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">float4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imagei
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imagei
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imageui
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imageui
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">uint4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imageh
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int2</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">half4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
        <div class="funcsynopsis">
          <table xmlns="" border="0" summary="Function synopsis" cellspacing="0" cellpadding="0">
            <tr valign="bottom">
              <td>
                <code xmlns="http://www.w3.org/1999/xhtml" class="funcdef">
                    <a class="link" href="scalarDataTypes.html" target="pagedisplay">void</a>
                    <strong class="fsfunc">
                        write_imageh
                    </strong>
                (</code>
                <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="otherDataTypes.html" target="pagedisplay">image2d_array_t</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">image</var>
                , </td>
              </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">int4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">coord</var>
                , </td>
            </tr>
            <tr valign="top">
              <td> </td>
              <td>
                    <a xmlns="http://www.w3.org/1999/xhtml" class="link" href="vectorDataTypes.html" target="pagedisplay">half4</a>
                     <var xmlns="http://www.w3.org/1999/xhtml" class="pdparam">color</var>
                <code>)</code></td>
            </tr>
          </table>
        </div>
      </div>
      <div class="refsect1">
        <a id="description"></a>
        <h2>Description</h2>
        <p>
        <code class="function">write_imagef</code> can only be used with image objects created with
        <code class="varname">image_channel_data_type</code> set to one of the pre-defined packed formats
        or set to <code class="constant">CL_SNORM_INT8</code>, <code class="constant">CL_UNORM_INT8</code>,
        <code class="constant">CL_SNORM_INT16</code>, <code class="constant">CL_UNORM_INT16</code>,
        <code class="constant">CL_HALF_FLOAT</code> or <code class="constant">CL_FLOAT</code>.  Appropriate data
        format conversion will be done to convert channel data from a floating-point value to
        actual data format in which the channels are stored.
      </p>
        <p>
        <code class="function">write_imagei</code> can only be used with image objects
        created with <code class="varname">image_channel_data_type</code> set to one of the following
        values: <code class="constant">CL_SIGNED_INT8</code>, <code class="constant">CL_SIGNED_INT16</code>,
        and <code class="constant">CL_SIGNED_INT32</code>.
      </p>
        <p>
        <code class="function">write_imageui</code> functions can only be used with image objects
        created with <code class="varname">image_channel_data_type</code> set to one of the following
        values: <code class="constant">CL_UNSIGNED_INT8</code>, <code class="constant">CL_UNSIGNED_INT16</code>,
        or <code class="constant">CL_UNSIGNED_INT32</code>.
      </p>
        <p>
        An application that wants to use <span class="type">half</span> and
        <span class="type">half<em class="replaceable"><code>n</code></em></span> types will need to include the <code class="code">#pragma
        OPENCL EXTENSION <a class="citerefentry" href="cl_khr_fp16.html"><span class="citerefentry"><span class="refentrytitle">cl_khr_fp16</span></span></a>
        : enable</code> directive.
      </p>
        <p>
        <code class="function">write_imageh</code> can only be used with image objects created with
        <code class="varname">image_channel_data_type</code> set to one of the pre-defined packed formats
        or set to <code class="constant">CL_SNORM_INT8</code>, <code class="constant">CL_UNORM_INT8</code>,
        <code class="constant">CL_SNORM_INT16</code>, <code class="constant">CL_UNORM_INT16</code> or
        <code class="constant">CL_HALF_FLOAT</code>.
      </p>
        <h4><a id="idp43176352"></a>Functions that take image2d_t</h4>
        <p>
        For the functions that take an image_2d_t image, write color value to location specified by
        <span class="emphasis"><em>coord.xy</em></span> in the 2D image object specified by <code class="varname">image</code>.
        Appropriate data format conversion to the specified image format is done before writing
        the color value. <span class="emphasis"><em>coord.x</em></span> and <span class="emphasis"><em>coord.y</em></span> are
        considered to be unnormalized coordinates and must be in the range 0 … 
        image width - 1, and 0 … image height - 1.
      </p>
        <p>
        For functions that take image_2d_t, the behavior of <code class="function">write_imagef</code>,
        <code class="function">write_imagei</code>, <code class="function">write_imageui</code>,
        and <code class="function">write_imageh</code> for image objects created with
        <code class="varname">image_channel_data_type</code> values not specified in the description
        above or with <span class="emphasis"><em>(x, y)</em></span> coordinate values that are not in the range
        (0 … image width - 1, 0 … image height - 1), respectively, is undefined.
      </p>
        <h4><a id="idp43183552"></a>Functions that take image2d_array_t</h4>
        <p>
        For the functions that take an image_2d_array_t image, write color value
        to location specified by <span class="emphasis"><em>coord.xy</em></span> in the 2D image
        identified by <span class="emphasis"><em>coord.z</em></span> in the 2D image array specified by
        <code class="varname">image</code>. Appropriate data format conversion to the specified
        image format is done before writing the color value. <span class="emphasis"><em>coord.x</em></span>,
        <span class="emphasis"><em>coord.y</em></span> and <span class="emphasis"><em>coord.z</em></span> are considered to be
        unnormalized coordinates and must be in the range 0 … image width - 1, 0 … image
        height - 1 and 0 … image number of layers - 1.
      </p>
        <p>
        For functions that take image_2d_array_t, the behavior of
        <code class="function">write_imagef</code>, <code class="function">write_imagei</code>,
        <code class="function">write_imageui</code>, and <code class="function">write_imageh</code> for image
        objects created with <code class="varname">image_channel_data_type</code> values not specified in
        the description above or with <span class="emphasis"><em>(x, y, z)</em></span> coordinate values that are
        not in the range (0 … image width - 1, 0 … image height - 1), respectively, is undefined.
      </p>
      </div>
      <div class="refsect1">
        <a id="notes"></a>
        <h2>Notes</h2>
        <p>
     The built-in functions defined in this section
    can only be used with image memory objects.  An image memory object can be accessed by
    specific function calls that read from and/or write to specific locations in the image.
  </p>
        <p>
    Image memory objects that are being read by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a>
    qualifier. <code class="function">write_image</code> calls to image memory objects declared with the
    <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__read_only</span></span></a>
    qualifier will generate a compilation error. Image memory objects that
    are being written to by a kernel should be declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a> qualifier.
    <code class="function">read_image</code> calls to image memory objects declared with the <a class="citerefentry" href="accessQualifiers.html"><span class="citerefentry"><span class="refentrytitle">__write_only</span></span></a>
    qualifier will generate a compilation error. <code class="function">read_image</code> and
    <code class="function">write_image</code> calls to the same image memory object in a kernel are
    not supported.
  </p>
        <p>
    The <code class="function">read_image</code> calls returns a four component floating-point, integer or
    unsigned integer color value. The color values returned by <code class="function">read_image</code>
    are identified as <code class="code">x, y, z, w</code> where <code class="code">x</code> refers to the red component,
    <code class="code">y</code> refers to the green component, <code class="code">z</code> refers to the blue component
    and <code class="code">w</code> refers to the alpha component.
  </p>
      </div>
      <div class="refsect1">
        <a id="specification"></a>
        <h2>Specification</h2>
        <p>
            <img src="pdficon_small1.gif" />

            <a href="http://www.khronos.org/registry/cl/specs/opencl-1.2.pdf#page=292" target="OpenCL Spec">OpenCL Specification</a>
        </p>
      </div>
      <div class="refsect1">
        <a id="seealso"></a>
        <h2>Also see</h2>
        <p>
            <a class="citerefentry" href="imageFunctions.html"><span class="citerefentry"><span class="refentrytitle">Image Functions</span></span></a>
        </p>
      </div>
      <div xmlns="" class="refsect3" lang="en" xml:lang="en"><a xmlns="http://www.w3.org/1999/xhtml" id="Copyright"></a><h4 xmlns="http://www.w3.org/1999/xhtml"></h4><img xmlns="http://www.w3.org/1999/xhtml" src="KhronosLogo.jpg" /><p xmlns="http://www.w3.org/1999/xhtml"></p>Copyright © 2007-2011 The Khronos Group Inc. 
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and/or associated documentation files (the
"Materials"), to deal in the Materials without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Materials, and to
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the condition that this copyright notice and permission notice shall be included
in all copies or substantial portions of the Materials. 
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