RGBToXYZ

RGB to XYZ color conversion. More...

Functions
NppStatus	nppiRGBToXYZ_8u_C3R_Ctx (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI, NppStreamContext nppStreamCtx)
	3 channel 8-bit unsigned packed RGB to 3 channel 8-bit unsigned packed XYZ color conversion. More...
NppStatus	nppiRGBToXYZ_8u_C3R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
NppStatus	nppiRGBToXYZ_8u_AC4R_Ctx (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI, NppStreamContext nppStreamCtx)
	4 channel 8-bit unsigned packed RGB with alpha to 4 channel 8-bit unsigned packed XYZ with alpha color conversion. More...
NppStatus	nppiRGBToXYZ_8u_AC4R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)

Detailed Description

RGB to XYZ color conversion.

Here is how NPP converts gamma corrected RGB or BGR to XYZ.

*  Npp32f nNormalizedR = (Npp32f)R * 0.003921569F; // / 255.0F

*  Npp32f nNormalizedG = (Npp32f)G * 0.003921569F;
*  Npp32f nNormalizedB = (Npp32f)B * 0.003921569F;
*  Npp32f nX = 0.412453F * nNormalizedR + 0.35758F  * nNormalizedG + 0.180423F * nNormalizedB; 
*  if (nX > 1.0F)
*      nX = 1.0F;
*  Npp32f nY = 0.212671F * nNormalizedR + 0.71516F  * nNormalizedG + 0.072169F * nNormalizedB;
*  if (nY > 1.0F)
*      nY = 1.0F;
*  Npp32f nZ = 0.019334F * nNormalizedR + 0.119193F * nNormalizedG + 0.950227F * nNormalizedB;
*  if (nZ > 1.0F)
*      nZ = 1.0F;
*  X = (Npp8u)(nX * 255.0F);
*  Y = (Npp8u)(nY * 255.0F);
*  Z = (Npp8u)(nZ * 255.0F);
*  

Function Documentation

NppStatus nppiRGBToXYZ_8u_AC4R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

NppStatus nppiRGBToXYZ_8u_AC4R_Ctx	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI,
		NppStreamContext	nppStreamCtx
	)

4 channel 8-bit unsigned packed RGB with alpha to 4 channel 8-bit unsigned packed XYZ 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).
nppStreamCtx	Application Managed Stream Context.

Returns

Image Data Related Error Codes, ROI Related Error Codes

NppStatus nppiRGBToXYZ_8u_C3R	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI
	)

NppStatus nppiRGBToXYZ_8u_C3R_Ctx	(	const Npp8u *	pSrc,
		int	nSrcStep,
		Npp8u *	pDst,
		int	nDstStep,
		NppiSize	oSizeROI,
		NppStreamContext	nppStreamCtx
	)

3 channel 8-bit unsigned packed RGB to 3 channel 8-bit unsigned packed XYZ 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).
nppStreamCtx	Application Managed Stream Context.

Returns

Image Data Related Error Codes, ROI Related Error Codes