HLSToRGB

HLS to RGB color conversion. More...

Functions
NppStatus	nppiHLSToRGB_8u_C3R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	3 channel 8-bit unsigned packed HLS to 3 channel 8-bit unsigned packed RGB color conversion. More...
NppStatus	nppiHLSToRGB_8u_AC4R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	4 channel 8-bit unsigned packed HLS with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion. More...

Detailed Description

HLS to RGB color conversion.

This is how NPP converts HLS to gamma corrected RGB or BGR.

*  Npp32f nNormalizedH = (Npp32f)H * 0.003921569F;  // / 255.0F

*  Npp32f nNormalizedL = (Npp32f)L * 0.003921569F;
*  Npp32f nNormalizedS = (Npp32f)S * 0.003921569F;
*  Npp32f nM1;
*  Npp32f nM2;
*  Npp32f nR;
*  Npp32f nG;
*  Npp32f nB;
*  Npp32f nh = 0.0F;
*  if (nNormalizedL <= 0.5F)
*      nM2 = nNormalizedL * (1.0F + nNormalizedS);
*  else

*      nM2 = nNormalizedL + nNormalizedS - nNormalizedL * nNormalizedS;
*  nM1 = 2.0F * nNormalizedL - nM2;
*  if (nNormalizedS == 0.0F)
*      nR = nG = nB = nNormalizedL;
*  else

*  {
*      nh = nNormalizedH + 0.3333F;
*      if (nh > 1.0F)
*          nh -= 1.0F;
*  }
*  Npp32f nMDiff = nM2 - nM1;
*  if (0.6667F < nh)
*      nR = nM1;
*  else

*  {    
*      if (nh < 0.1667F)
*          nR = (nM1 + nMDiff * nh * 6.0F); // / 0.1667F

*      else if (nh < 0.5F)
*          nR = nM2;
*      else

*          nR = nM1 + nMDiff * ( 0.6667F - nh ) * 6.0F; // / 0.1667F

*  }
*  if (nR > 1.0F)
*      nR = 1.0F;     
*  nh = nNormalizedH;
*  if (0.6667F < nh)
*      nG = nM1;
*  else

*  {
*      if (nh < 0.1667F)
*          nG = (nM1 + nMDiff * nh * 6.0F); // / 0.1667F

*      else if (nh < 0.5F)
*          nG = nM2;
*      else

*          nG = nM1 + nMDiff * (0.6667F - nh ) * 6.0F; // / 0.1667F

*  }
*  if (nG > 1.0F)
*      nG = 1.0F;     
*  nh = nNormalizedH - 0.3333F;
*  if (nh < 0.0F)
*      nh += 1.0F;
*  if (0.6667F < nh)
*      nB = nM1;
*  else

*  {
*      if (nh < 0.1667F)
*          nB = (nM1 + nMDiff * nh * 6.0F); // / 0.1667F

*      else if (nh < 0.5F)
*          nB = nM2;
*      else

*          nB = nM1 + nMDiff * (0.6667F - nh ) * 6.0F; // / 0.1667F

*  }        
*  if (nB > 1.0F)
*      nB = 1.0F;     
*  R = (Npp8u)(nR * 255.0F);
*  G = (Npp8u)(nG * 255.0F);
*  B = (Npp8u)(nB * 255.0F);
*  

Function Documentation

NppStatus nppiHLSToRGB_8u_AC4R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

4 channel 8-bit unsigned packed HLS with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Source-Image Line Step.
pDst	Destination-Image Pointer.
nDstStep	Destination-Image Line Step.
oSizeROI	Region-of-Interest (ROI).

Returns

Image Data Related Error Codes, ROI Related Error Codes

NppStatus nppiHLSToRGB_8u_C3R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

3 channel 8-bit unsigned packed HLS to 3 channel 8-bit unsigned packed RGB color conversion.

Parameters

pSrc	Source-Image Pointer.
nSrcStep	Source-Image Line Step.
pDst	Destination-Image Pointer.
nDstStep	Destination-Image Line Step.
oSizeROI	Region-of-Interest (ROI).

Returns

Image Data Related Error Codes, ROI Related Error Codes