Optoma HD806 Projector Calibration and Settings
We calibrate each home theater that is reviewed. It is a pretty standard calibration, there's always more that can be done by some of the "hi-end" calibrators.
12/15/2008 - Art Feierman
Optoma HD806 Color Temperature
First, here are the color temperture measurements for the Cinema mode, right out of the box
30 IRE – 6412
50 IRE – 6503
80 IRE – 6528
100 IRE – 6465
Very good, but they can be improved a bit.
Optoma HD806 Basic Settings
In addition to calibrating Red Green and Blue for a correct grayscale balance (6500K), there are a number of other settings that come into play. Typically Contrast and Brightness (white balance and black balance), need to be done first. Color saturation and gamma also need adjustment.
Our final settings (numbers in parens are the default numbers):
Cinema = 45 (44), Bright = 42 (46), TV = 43 (45), sRGB = 44 (45), User = 46 (50)
Cinema = 44 (43), Bright = 44 (44), TV = 46 (45), sRGB = 45 (44), User = 45 (44)
Cinema = (47), Bright = (54), TV = 60), sRGB (52) User = (50)
Tint = (50), adjusted for User mode to 47
Mike did not adjust saturation.
All other settings are at their defaults for those modes.
Zoom was set at mid-range, All other settings at default
Optoma HD806 Post Calibration Grayscale
The HD806 produced good post calibration results, with a resulting good picture, but this Optoma does not calibrate particularly well, and most other projectors can produce output consistently closer to the ideal 6500K. That said, the picture color is very good, and very watchable. Here are the measurements after calibration, for Pure Cinema Mode:
White (100 IRE): 6752K
Light gray (80 IRE): 6553K
Medium gray (50 IRE): 6609K
Dark gray (30 IRE): 6489K
The default color settings for User, are cooler than the defaults for Cinema mode. Unfortunately, the Optoma does not allow you to specify which preset's color settings you want to start with. So, we started with User, and ended up with a little wider swing in temperature range, than the default Cinema, but, despite that, a slightly better balanced image.
The default color settings for User, are cooler than the defaults for Cinema mode. Unfortunately, the Optoma HD806 does not allow you to specify a particular preset for the starting point in a calibration. So we started with what User served up, and ended up with a little wider swing in temperature range, than the default for Cinema. Despite that, we ended up with a slightly better balanced image, overall.
Gamma measured to 2.28, pretty close to the ideal 2.2 for movie watching. We did not measure different degamma's (Film, Video, etc.) Video, however nicely lowers the gamma to give a big more brightness to the mid and darker areas for better TV and sports type viewing.
These are the adjustments we made to Red, Green and Blue for the grayscale balance of the User mode
Red Gain: 105 (100)
Green Gain: 100 (100)
Blue Gain: 98 (100)
Red Bias: (127)
Green Bias: (127)
Blue Bias: (127)
Resulting color temperature of white: 6742K, but the rest of the range is almost dead on.
For a quick calibrate of "brightest mode" Mike recommends using the User setting, with the color temp set to warm (instead of User). Not quite as good a color balance, but it takes you back up a couple hundred lumens in brightness, to about the original Cinema measurement in the mid-1700 lumen range.