NVIDIA FX5500 User Guide - Page 84

XNVCTRLSetGvoColorConversion(), Display *dpy, int screen, float colorMatrix[3][3]

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CHAPTER 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]); NVIDIA Corporation 80 Quadro FX 4500/5500 SDI User's Guide- Version 2.0

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NVIDIA Corporation
80
Quadro FX 4500/5500 SDI User’s Guide
– Version 2.0
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]);