XYZToRGB

XYZ to RGB color conversion. More...

Functions
NppStatus	nppiXYZToRGB_8u_C3R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	3 channel 8-bit unsigned packed XYZ to 3 channel 8-bit unsigned packed RGB color conversion. More...
NppStatus	nppiXYZToRGB_8u_AC4R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
	4 channel 8-bit unsigned packed XYZ with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion. More...

Detailed Description

XYZ to RGB color conversion.

Here is how NPP converts XYZ to gamma corrected RGB or BGR. The code assumes that X,Y, and Z values are in the range [0..1].

*  Npp32f nNormalizedX = (Npp32f)X * 0.003921569F; // / 255.0F

*  Npp32f nNormalizedY = (Npp32f)Y * 0.003921569F;
*  Npp32f nNormalizedZ = (Npp32f)Z * 0.003921569F;
*  Npp32f nR = 3.240479F * nNormalizedX - 1.53715F  * nNormalizedY - 0.498535F * nNormalizedZ; 
*  if (nR > 1.0F)
*      nR = 1.0F;
*  Npp32f nG = -0.969256F * nNormalizedX + 1.875991F  * nNormalizedY + 0.041556F * nNormalizedZ;
*  if (nG > 1.0F)
*      nG = 1.0F;
*  Npp32f nB = 0.055648F * nNormalizedX - 0.204043F * nNormalizedY + 1.057311F * nNormalizedZ;
*  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 nppiXYZToRGB_8u_AC4R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

4 channel 8-bit unsigned packed XYZ 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 nppiXYZToRGB_8u_C3R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

3 channel 8-bit unsigned packed XYZ 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