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nvidia-cuda-toolkit-devel-10.1.168-1.2.mga7.nonfree.x86_64.rpm

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<title>NVIDIA 2D Image And Signal Performance Primitives (NPP): LabToBGR</title>
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<div class="header">
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<a href="#func-members">Functions</a>  </div>
  <div class="headertitle">
<div class="title">LabToBGR<div class="ingroups"><a class="el" href="group__image__color__model__conversion.html">Color Model Conversion</a></div></div>  </div>
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<div class="contents">

<p>Lab to BGR color conversion.  
<a href="#details">More...</a></p>
<table class="memberdecls">
<tr class="heading"><td colspan="2"><h2 class="groupheader"><a name="func-members"></a>
Functions</h2></td></tr>
<tr class="memitem:ga01a18867e326c3513c00921ffa87ab23"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__labtobgr.html#ga01a18867e326c3513c00921ffa87ab23">nppiLabToBGR_8u_C3R_Ctx</a> (const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pSrc, int nSrcStep, <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pDst, int nDstStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSizeROI, <a class="el" href="struct_npp_stream_context.html">NppStreamContext</a> nppStreamCtx)</td></tr>
<tr class="memdesc:ga01a18867e326c3513c00921ffa87ab23"><td class="mdescLeft">&#160;</td><td class="mdescRight">3 channel 8-bit unsigned packed Lab to 3 channel 8-bit unsigned packed BGR color conversion.  <a href="#ga01a18867e326c3513c00921ffa87ab23">More...</a><br/></td></tr>
<tr class="separator:ga01a18867e326c3513c00921ffa87ab23"><td class="memSeparator" colspan="2">&#160;</td></tr>
<tr class="memitem:ga2a004f85f0f8c0d7a68b605f01bc1cd6"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a>&#160;</td><td class="memItemRight" valign="bottom"><a class="el" href="group__labtobgr.html#ga2a004f85f0f8c0d7a68b605f01bc1cd6">nppiLabToBGR_8u_C3R</a> (const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pSrc, int nSrcStep, <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *pDst, int nDstStep, <a class="el" href="struct_nppi_size.html">NppiSize</a> oSizeROI)</td></tr>
<tr class="separator:ga2a004f85f0f8c0d7a68b605f01bc1cd6"><td class="memSeparator" colspan="2">&#160;</td></tr>
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<a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2>
<p>Lab to BGR color conversion. </p>
<p>This is how NPP converts Lab to gamma corrected BGR or RGB using the CIE Lab D65 white point with a Y luminance of 1.0. The code uses powf() the 32 bit floating point power math function.</p>
<div class="fragment"><div class="line">*  <span class="comment">// use CIE Lab chromaticity coordinates</span></div>
<div class="line">*  #define nCIE_LAB_D65_xn 0.950455F</div>
<div class="line">*  #define nCIE_LAB_D65_yn 1.0F</div>
<div class="line">*  #define nCIE_LAB_D65_zn 1.088753F</div>
<div class="line">*  <span class="comment">// First convert Lab back to original range then to CIE XYZ</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nL = (<a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a>)L * 100.0F * 0.003921569F;  <span class="comment">// / 255.0F</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nA = (<a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a>)a - 128.0F;</div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nB = (<a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a>)b - 128.0F;</div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nP = (nL + 16.0F) * 0.008621F; <span class="comment">// / 116.0F</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedY = nP * nP * nP; <span class="comment">// powf(nP, 3.0F);</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedX = nCIE_LAB_D65_xn * powf((nP + nA * 0.002F), 3.0F); <span class="comment">// / 500.0F</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedZ = nCIE_LAB_D65_zn * powf((nP - nB * 0.005F), 3.0F); <span class="comment">// / 200.0F</span></div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nR = 3.240479F * nNormalizedX - 1.53715F  * nNormalizedY - 0.498535F * nNormalizedZ; </div>
<div class="line">*  <span class="keywordflow">if</span> (nR &gt; 1.0F)</div>
<div class="line">*      nR = 1.0F;</div>
<div class="line">*  <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nG = -0.969256F * nNormalizedX + 1.875991F  * nNormalizedY + 0.041556F * nNormalizedZ;</div>
<div class="line">*  <span class="keywordflow">if</span> (nG &gt; 1.0F)</div>
<div class="line">*      nG = 1.0F;</div>
<div class="line">*  nB = 0.055648F * nNormalizedX - 0.204043F * nNormalizedY + 1.057311F * nNormalizedZ;</div>
<div class="line">*  <span class="keywordflow">if</span> (nB &gt; 1.0F)</div>
<div class="line">*      nB = 1.0F;</div>
<div class="line">*  R = (<a class="code" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a>)(nR * 255.0F);</div>
<div class="line">*  G = (<a class="code" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a>)(nG * 255.0F);</div>
<div class="line">*  B = (<a class="code" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a>)(nB * 255.0F);</div>
<div class="line">*  </div>
</div><!-- fragment --> <h2 class="groupheader">Function Documentation</h2>
<a class="anchor" id="ga2a004f85f0f8c0d7a68b605f01bc1cd6"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> nppiLabToBGR_8u_C3R </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>nSrcStep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>nDstStep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a>&#160;</td>
          <td class="paramname"><em>oSizeROI</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

</div>
</div>
<a class="anchor" id="ga01a18867e326c3513c00921ffa87ab23"></a>
<div class="memitem">
<div class="memproto">
      <table class="memname">
        <tr>
          <td class="memname"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> nppiLabToBGR_8u_C3R_Ctx </td>
          <td>(</td>
          <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *&#160;</td>
          <td class="paramname"><em>pSrc</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>nSrcStep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> *&#160;</td>
          <td class="paramname"><em>pDst</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype">int&#160;</td>
          <td class="paramname"><em>nDstStep</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="struct_nppi_size.html">NppiSize</a>&#160;</td>
          <td class="paramname"><em>oSizeROI</em>, </td>
        </tr>
        <tr>
          <td class="paramkey"></td>
          <td></td>
          <td class="paramtype"><a class="el" href="struct_npp_stream_context.html">NppStreamContext</a>&#160;</td>
          <td class="paramname"><em>nppStreamCtx</em>&#160;</td>
        </tr>
        <tr>
          <td></td>
          <td>)</td>
          <td></td><td></td>
        </tr>
      </table>
</div><div class="memdoc">

<p>3 channel 8-bit unsigned packed Lab to 3 channel 8-bit unsigned packed BGR color conversion. </p>
<dl class="params"><dt>Parameters</dt><dd>
  <table class="params">
    <tr><td class="paramname">pSrc</td><td><a class="el" href="nppi_conventions_lb.html#source_image_pointer">Source-Image Pointer</a>. </td></tr>
    <tr><td class="paramname">nSrcStep</td><td><a class="el" href="nppi_conventions_lb.html#source_image_line_step">Source-Image Line Step</a>. </td></tr>
    <tr><td class="paramname">pDst</td><td><a class="el" href="nppi_conventions_lb.html#destination_image_pointer">Destination-Image Pointer</a>. </td></tr>
    <tr><td class="paramname">nDstStep</td><td><a class="el" href="nppi_conventions_lb.html#destination_image_line_step">Destination-Image Line Step</a>. </td></tr>
    <tr><td class="paramname">oSizeROI</td><td><a class="el" href="nppi_conventions_lb.html#roi_specification">Region-of-Interest (ROI)</a>. </td></tr>
    <tr><td class="paramname">nppStreamCtx</td><td><a class="el" href="index.html#application_managed_stream_context">Application Managed Stream Context</a>. </td></tr>
  </table>
  </dd>
</dl>
<dl class="section return"><dt>Returns</dt><dd><a class="el" href="nppi_conventions_lb.html#image_data_error_codes">Image Data Related Error Codes</a>, <a class="el" href="nppi_conventions_lb.html#roi_error_codes">ROI Related Error Codes</a> </dd></dl>

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