Nvidia FX4500 - Apple MAC Pro QUADRO FX 4500 Video Card 630-7532 User Manual page 82

XNVCTRLQueryGvoColorConversion()
Bool XNVCTRLQueryGvoColorConversion (
Display *dpy,
int screen,
float colorMatrix[3][3],
float colorOffset[3],
float colorScale[3]
);
This function retrieves the color conversion matrix and color offset that are currently
being used for GVO (Graphic to Video Out). The values are ordered within the arrays
according to the comments for XNVCTRLSetGvoColorConversion().
Possible errors:

BadMatch ‐ The NVIDIA driver is not present on that screen.

BadImplementation ‐ GVO is not available on that screen.
Quadro 4000/5000/6000 SDI
Chapter 05 : API Control
DU-05337-001_v01 | 78