Nvidia Quadro FX 4800 - Page 78

NVIDIA Corporation
74 Quadro FX 4800/5800 and Quadro CX SDI User’s Guide– Version 1.0
C
HAPTER 5
API Control
XNVCTRLSetGvoColorConversion()
void XNVCTRLSetGvoColorConversion (
Display *dpy,
int screen,
float colorMatrix[3][3],
float colorOffset[3],
float colorScale[3]
);
Thisfunctionsetsthecolorconversionmatrix,offset,andscalethatshouldbeusedfor
GVO(GraphictoVideoOut).
TheColorSpaceConversiondataisorderedasfollows:
• colorMatrix[0][0]//r.Y
• colorMatrix[0][1]//g.Y
• colorMatrix[0][2]//b.Y
• colorMatrix[1][0]//r.Cr
• colorMatrix[1][1]//g.Cr
• colorMatrix[1][2]//b.Cr
• colorMatrix[2][0]
//r.Cb
• colorMatrix[2][1]//g.Cb
• colorMatrix[2][2]//b.Cb
• colorOffset[0]//Y
• colorOffset[1]//Cr
• colorOffset[2]//Cb
• colorScale[0]//Y
• colorScale[1]//Cr
• colorScale[2]//Cb
wherethedataisusedaccordingtothefollowingformulae:
• Y=colorOffset[0]+colorScale[0]*
(R*colorMatrix[0][0]+G
*colorMatrix[0][1]+B*colorMatrix[0][2]);