HSVToRGB

HSV to RGB color conversion. More...

Functions
NppStatus	nppiHSVToRGB_8u_C3R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	3 channel 8-bit unsigned packed HSV to 3 channel 8-bit unsigned packed RGB color conversion. More...
NppStatus	nppiHSVToRGB_8u_AC4R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	4 channel 8-bit unsigned packed HSV with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion. More...

Detailed Description

HSV to RGB color conversion.

This is how NPP converts HSV to gamma corrected RGB or BGR. This code uses the floorf() 32 bit floating point math function.

*  Npp32f nNormalizedH = (Npp32f)H * 0.003921569F; // / 255.0F
*  Npp32f nNormalizedS = (Npp32f)S * 0.003921569F;
*  Npp32f nNormalizedV = (Npp32f)V * 0.003921569F;
*  Npp32f nR;
*  Npp32f nG;
*  Npp32f nB;
*  if (nNormalizedS == 0.0F)
*  {
*      nR = nG = nB = nNormalizedV;
*  }
*  else
*  {
*      if (nNormalizedH == 1.0F)
*          nNormalizedH = 0.0F;
*      else
*          nNormalizedH = nNormalizedH * 6.0F; // / 0.1667F
*  }
*  Npp32f nI = floorf(nNormalizedH);
*  Npp32f nF = nNormalizedH - nI;
*  Npp32f nM = nNormalizedV * (1.0F - nNormalizedS);
*  Npp32f nN = nNormalizedV * (1.0F - nNormalizedS * nF);
*  Npp32f nK = nNormalizedV * (1.0F - nNormalizedS * (1.0F - nF));
*  if (nI == 0.0F)
*      { nR = nNormalizedV; nG = nK; nB = nM; }
*  else if (nI == 1.0F)
*      { nR = nN; nG = nNormalizedV; nB = nM; }
*  else if (nI == 2.0F)
*      { nR = nM; nG = nNormalizedV; nB = nK; }
*  else if (nI == 3.0F)
*      { nR = nM; nG = nN; nB = nNormalizedV; }
*  else if (nI == 4.0F)
*      { nR = nK; nG = nM; nB = nNormalizedV; }
*  else if (nI == 5.0F)
*      { nR = nNormalizedV; nG = nM; nB = nN; }
*  R = (Npp8u)(nR * 255.0F);
*  G = (Npp8u)(nG * 255.0F);
*  B = (Npp8u)(nB * 255.0F);
*  

Function Documentation

NppStatus nppiHSVToRGB_8u_AC4R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

4 channel 8-bit unsigned packed HSV 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 nppiHSVToRGB_8u_C3R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

3 channel 8-bit unsigned packed HSV 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