NVIDIA 2D Image And Signal Performance Primitives (NPP)  Version 11.7.1.*
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Functions

XYZ to RGB color conversion. More...

Functions

NppStatus nppiXYZToRGB_8u_C3R_Ctx (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI, NppStreamContext nppStreamCtx)
 3 channel 8-bit unsigned packed XYZ to 3 channel 8-bit unsigned packed RGB color conversion. More...
 
NppStatus nppiXYZToRGB_8u_C3R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
 
NppStatus nppiXYZToRGB_8u_AC4R_Ctx (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI, NppStreamContext nppStreamCtx)
 4 channel 8-bit unsigned packed XYZ with alpha to 4 channel 8-bit unsigned packed RGB with alpha color conversion. More...
 
NppStatus nppiXYZToRGB_8u_AC4R (const Npp8u *pSrc, int nSrcStep, Npp8u *pDst, int nDstStep, NppiSize oSizeROI)
 

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 
)
NppStatus nppiXYZToRGB_8u_AC4R_Ctx ( const Npp8u pSrc,
int  nSrcStep,
Npp8u pDst,
int  nDstStep,
NppiSize  oSizeROI,
NppStreamContext  nppStreamCtx 
)

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

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
oSizeROIRegion-of-Interest (ROI).
nppStreamCtxApplication Managed Stream Context.
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 
)
NppStatus nppiXYZToRGB_8u_C3R_Ctx ( const Npp8u pSrc,
int  nSrcStep,
Npp8u pDst,
int  nDstStep,
NppiSize  oSizeROI,
NppStreamContext  nppStreamCtx 
)

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

Parameters
pSrcSource-Image Pointer.
nSrcStepSource-Image Line Step.
pDstDestination-Image Pointer.
nDstStepDestination-Image Line Step.
oSizeROIRegion-of-Interest (ROI).
nppStreamCtxApplication Managed Stream Context.
Returns
Image Data Related Error Codes, ROI Related Error Codes

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