To adjust for gamma, press "menu 0910" to enable extra items within the menu. Under the "IN->CONFIG->COLR" menu you'll see a CTMP (for Color temperature) selection.
This allows the grayscale color-temperature to be calibrated at input levels of 100, 80, 50, 30, and 20 IRE.
This feature is intended for fine-tuning the grayscale after the projector, or HDTV, grayscale color temperature has been calibrated. We recommend that the display be calibrated at 100 and 30 IRE using its internal grayscale calibration controls, before using this feature. This calibration feature operates like the grayscale calibration in projectors, except there are five points of calibration (100, 80, 50, 30, 20), rather than the typical two points. If the projectorâ€™s or HDTVâ€™s service codes are not known, this feature allows the system grayscale to still be calibrated.
Keep the "LUMA" value at the respective level (i.e. 100, 80, 50, 30, and 20) for a standard (linear) response through the Vision. For example, if Green were increased by two clicks to correct color-temperature, select the LUMA entry and down click it once to put the LUMA value back to the correct level. As another example, if 100 IRE must be corrected, the â€œLUMAâ€ level out can no longer reach 100 IRE since it is a weighted average of red, green and blue.
If the calibrated â€œ100 IREâ€ point has a â€œLUMAâ€ value of 2% less than 100 (98), then reduce the LUMA of each of the lower four points (80, 50, 30 , and 20) by 2% to keep a linear response through the Vision (in this case resulting in 98, 78, 49, 29, and 20 as the â€œLUMAâ€ settings in the menu).
You can also use the "LUMA" value to change the gamma curve of the Vision. We recommend the LUMA response curve be left as linear, unless a trained technician with the proper equipment is available to calibrate gamma. Improper gamma settings can easily degrade picture quality.