<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <meta http-equiv="Content-Type" content="text/xhtml;charset=UTF-8"/> <meta http-equiv="X-UA-Compatible" content="IE=9"/> <meta name="generator" content="Doxygen 1.8.5"/> <title>NVIDIA 2D Image And Signal Performance Primitives (NPP): LUVToRGB</title> <link href="tabs.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="jquery.js"></script> <script type="text/javascript" src="dynsections.js"></script> <link href="search/search.css" rel="stylesheet" type="text/css"/> <script type="text/javascript" src="search/search.js"></script> <script type="text/javascript"> $(document).ready(function() { searchBox.OnSelectItem(0); }); </script> <link href="doxygen.css" rel="stylesheet" type="text/css" /> </head> <body> <div id="top"><!-- do not remove this div, it is closed by doxygen! --> <div id="titlearea"> <table cellspacing="0" cellpadding="0"> <tbody> <tr style="height: 56px;"> <td style="padding-left: 0.5em;"> <div id="projectname">NVIDIA 2D Image And Signal Performance Primitives (NPP)  <span id="projectnumber">Version 10.1.1</span> </div> </td> </tr> </tbody> </table> </div> <!-- end header part --> <!-- Generated by Doxygen 1.8.5 --> <script type="text/javascript"> var searchBox = new SearchBox("searchBox", "search",false,'Search'); </script> <div id="navrow1" class="tabs"> <ul class="tablist"> <li><a href="index.html"><span>Main Page</span></a></li> <li><a href="pages.html"><span>Related Pages</span></a></li> <li><a href="modules.html"><span>Modules</span></a></li> <li><a href="annotated.html"><span>Data Structures</span></a></li> <li> <div id="MSearchBox" class="MSearchBoxInactive"> <span class="left"> <img id="MSearchSelect" src="search/mag_sel.png" onmouseover="return searchBox.OnSearchSelectShow()" onmouseout="return searchBox.OnSearchSelectHide()" alt=""/> 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src="javascript:void(0)" frameborder="0" name="MSearchResults" id="MSearchResults"> </iframe> </div> <div class="header"> <div class="summary"> <a href="#func-members">Functions</a> </div> <div class="headertitle"> <div class="title">LUVToRGB<div class="ingroups"><a class="el" href="group__image__color__model__conversion.html">Color Model Conversion</a></div></div> </div> </div><!--header--> <div class="contents"> <p>LUV to RGB 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:gaf439deaf988c66ca70b7956767fb32cc"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__luvtorgb.html#gaf439deaf988c66ca70b7956767fb32cc">nppiLUVToRGB_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:gaf439deaf988c66ca70b7956767fb32cc"><td class="mdescLeft"> </td><td class="mdescRight">3 channel 8-bit unsigned packed LUV to 3 channel 8-bit unsigned packed RGB color conversion. <a href="#gaf439deaf988c66ca70b7956767fb32cc">More...</a><br/></td></tr> <tr class="separator:gaf439deaf988c66ca70b7956767fb32cc"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga19c0b817bf62bfc7d098bc5a7eb17f92"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__luvtorgb.html#ga19c0b817bf62bfc7d098bc5a7eb17f92">nppiLUVToRGB_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:ga19c0b817bf62bfc7d098bc5a7eb17f92"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga55c00e90cf51b4b1ac0147cd264e156e"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__luvtorgb.html#ga55c00e90cf51b4b1ac0147cd264e156e">nppiLUVToRGB_8u_AC4R_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:ga55c00e90cf51b4b1ac0147cd264e156e"><td class="mdescLeft"> </td><td class="mdescRight">4 channel 8-bit unsigned packed LUV with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion. <a href="#ga55c00e90cf51b4b1ac0147cd264e156e">More...</a><br/></td></tr> <tr class="separator:ga55c00e90cf51b4b1ac0147cd264e156e"><td class="memSeparator" colspan="2"> </td></tr> <tr class="memitem:ga57af7f3f79ecd740f6da7c30fd13f441"><td class="memItemLeft" align="right" valign="top"><a class="el" href="group__typedefs__npp.html#ga1105a17b5e76381583c46ecd6a60fe21">NppStatus</a> </td><td class="memItemRight" valign="bottom"><a class="el" href="group__luvtorgb.html#ga57af7f3f79ecd740f6da7c30fd13f441">nppiLUVToRGB_8u_AC4R</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:ga57af7f3f79ecd740f6da7c30fd13f441"><td class="memSeparator" colspan="2"> </td></tr> </table> <a name="details" id="details"></a><h2 class="groupheader">Detailed Description</h2> <p>LUV to RGB color conversion. </p> <p>Here is how NPP converts CIE LUV to gamma corrected RGB or BGR using the CIE XYZ 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 D65 chromaticity coordinates</span></div> <div class="line">* #define nCIE_XYZ_D65_xn 0.312713F</div> <div class="line">* #define nCIE_XYZ_D65_yn 0.329016F</div> <div class="line">* #define nn_DIVISOR (-2.0F * nCIE_XYZ_D65_xn + 12.0F * nCIE_XYZ_D65_yn + 3.0F)</div> <div class="line">* #define nun (4.0F * nCIE_XYZ_D65_xn / nn_DIVISOR)</div> <div class="line">* #define nvn (9.0F * nCIE_XYZ_D65_yn / nn_DIVISOR)</div> <div class="line">* </div> <div class="line">* <span class="comment">// First convert normalized LUV back to original CIE LUV range</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> nU = ((<a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a>)U * 354.0F * 0.003921569F) - 134.0F;</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nV = ((<a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a>)V * 262.0F * 0.003921569F) - 140.0F;</div> <div class="line">* <span class="comment">// Now convert LUV to CIE XYZ</span></div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nTemp = 13.0F * nL;</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nu = nU / nTemp + nun;</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nv = nV / nTemp + nvn;</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedY;</div> <div class="line">* <span class="keywordflow">if</span> (nL > 7.9996248F)</div> <div class="line">* {</div> <div class="line">* nNormalizedY = (nL + 16.0F) * 0.008621F; <span class="comment">// / 116.0F</span></div> <div class="line">* nNormalizedY = powf(nNormalizedY, 3.0F);</div> <div class="line">* }</div> <div class="line">* <span class="keywordflow">else</span></div> <div class="line">* { </div> <div class="line">* nNormalizedY = nL * 0.001107F; <span class="comment">// / 903.3F</span></div> <div class="line">* } </div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedX = (-9.0F * nNormalizedY * nu) / ((nu - 4.0F) * nv - nu * nv);</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nNormalizedZ = (9.0F * nNormalizedY - 15.0F * nv * nNormalizedY - nv * nNormalizedX) / (3.0F * nv);</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 > 1.0F)</div> <div class="line">* nR = 1.0F;</div> <div class="line">* <span class="keywordflow">if</span> (nR < 0.0F)</div> <div class="line">* nR = 0.0F;</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 > 1.0F)</div> <div class="line">* nG = 1.0F;</div> <div class="line">* <span class="keywordflow">if</span> (nG < 0.0F)</div> <div class="line">* nG = 0.0F;</div> <div class="line">* <a class="code" href="group__npp__basic__types.html#ga274ed0e3c4cbc89f644143f64e2391ee">Npp32f</a> nB = 0.055648F * nNormalizedX - 0.204043F * nNormalizedY + 1.057311F * nNormalizedZ;</div> <div class="line">* <span class="keywordflow">if</span> (nB > 1.0F)</div> <div class="line">* nB = 1.0F;</div> <div class="line">* <span class="keywordflow">if</span> (nB < 0.0F)</div> <div class="line">* nB = 0.0F;</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="ga57af7f3f79ecd740f6da7c30fd13f441"></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> nppiLUVToRGB_8u_AC4R </td> <td>(</td> <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td> <td class="paramname"><em>pSrc</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> * </td> <td class="paramname"><em>pDst</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> </td> <td class="paramname"><em>oSizeROI</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> </div> </div> <a class="anchor" id="ga55c00e90cf51b4b1ac0147cd264e156e"></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> nppiLUVToRGB_8u_AC4R_Ctx </td> <td>(</td> <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td> <td class="paramname"><em>pSrc</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> * </td> <td class="paramname"><em>pDst</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> </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> </td> <td class="paramname"><em>nppStreamCtx</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> <p>4 channel 8-bit unsigned packed LUV with alpha to 4 channel 8-bit unsigned packed RGB with alpha 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> </div> </div> <a class="anchor" id="ga19c0b817bf62bfc7d098bc5a7eb17f92"></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> nppiLUVToRGB_8u_C3R </td> <td>(</td> <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td> <td class="paramname"><em>pSrc</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> * </td> <td class="paramname"><em>pDst</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> </td> <td class="paramname"><em>oSizeROI</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> </div> </div> <a class="anchor" id="gaf439deaf988c66ca70b7956767fb32cc"></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> nppiLUVToRGB_8u_C3R_Ctx </td> <td>(</td> <td class="paramtype">const <a class="el" href="group__npp__basic__types.html#ga29b502b6816fc0066fd59538483a5b62">Npp8u</a> * </td> <td class="paramname"><em>pSrc</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> * </td> <td class="paramname"><em>pDst</em>, </td> </tr> <tr> <td class="paramkey"></td> <td></td> <td class="paramtype">int </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> </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> </td> <td class="paramname"><em>nppStreamCtx</em> </td> </tr> <tr> <td></td> <td>)</td> <td></td><td></td> </tr> </table> </div><div class="memdoc"> <p>3 channel 8-bit unsigned packed LUV to 3 channel 8-bit unsigned packed RGB 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> </div> </div> </div><!-- contents --> <HR> <center>Copyright © 2009-2019 NVIDIA Corporation</center> <HR>