Optoma GT720 Projector Calibration and Settings-2

Posted on July 8, 2011 by Art Feierman

Optoma GT720 Post Calibration Grayscale: Standard Mode

Color Temp over IRE Range (Post calibration):
20 IRE	6603
30 IRE	6630
40 IRE	6642
50 IRE	6589
60 IRE	6828
70 IRE	6626
80 IRE	6426
90 IRE	6407
100 IRE	6321
Average gamma = 2.09

Mike's NOTES: Grayscale calibration is difficult because there is no picture mode where the RGB balance is consistent across the IRE range. This is made more difficult by the fact that the Gain settings mainly affect color saturation (like a Color control) and the Bias settings affect the entire IRE range.

For a better looking Bright mode without affecting lumen output, I would turn down the Red gain to about 10 as was done in the calibrated mode.

RGB Settings

Post-Calibration:

Calibration settings for User mode:

Starting settings are from Cinema, but with Brilliant Color on 10, Contrast on 47 and Brightness on 50.

GT720 Post Calibration settings:

Calibration settings for Standard: Color is on 40, all other settings same as pre-calibration or as stated below.

User –
Contrast (Gain)	R = (30) 10
	G = (30)
	B = (30)
Brightness (Bias)	R = (0)
	G = (0) 2
	B = (0) -3
Lumens at 100 IRE:	1810

After Mike's calibration of the GT720 he points out that getting the colors to look best in general costs barely 15% of the maximum brightness of this Optoma projector. As such most folks may well prefer our User settings to any of the GT720 defaults.