Optoma HD8200 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. Our calibrations, including the HD8200, are normally limited to a grayscale calibration, along with brightness, contrast, color saturation, etc.
3/29/09 - Art Feierman
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Optoma HD8200 Color Temperature
Since the HD8200's Cinema mode was very cool (blue) in color balance, and almost identical to their User mode, we built our calibrated settings from User. Here are the User measurements BEFORE calibration
30 IRE – 7277K
50 IRE – 7310K
80 IRE – 7196K
100 IRE – 7201K
That's pretty far off the mark, although consistent from dark grays to white.
Optoma HD8200 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 Bright Photo Reference User
Contrast = 46 (44) 38 (43) 33 (43) 46 (44) 42 (44)
Brightness= 40 (38) 40 (50) 46 (51) 41 (38) 41 (41)
Color Temp= Warm Medium Cold Warm Warm
Color= (55) (57) (52) (50) 50 (50)
Gamma= Film Video Graphics Standard Standard
Tint= (50) for all, User mode adjusted to 48
All other settings are at their defaults for those modes.
Zoom was set at mid-range,
All other settings at default
Optoma HD8200 Post Calibration Grayscale
Post calibration, we ended up with excellent grayscale balance which was evident, when watching the HD8200.
20 IRE - 6563K
30 IRE - 6535K
40 IRE - 6619K
50 IRE - 6574K
60 IRE - 6532K
70 IRE - 6504K
80 IRE - 6458K
90 IRE - 6448K
100 IRE – 6481K
That's about as tight, and as close to 6500K as any projector is likely to get.
Gamma: The closest gamma to the target 2.2 for movie viewing is Standard, which averaged 2.13, definitely pretty close.
RGB Settings
These are the adjustments we made to Red, Green and Blue for the grayscale balance of the User mode, to get the measurements listed above.
Calibration settings: (default in parenthesis):
Red Gain= 1 (1)
Green Gain = 0 (0)
Blue Gain= -1 (2)
Red Offset= (-1)
Green Offset= (-1)
Blue Offset= (-1)
For a quick calibrate of "brightest mode" Mike recommends using Reference. He reports that after brightness and contrast are adjusted, it has the brightnest measurements, and also has the best grayscale of the "brighter" modes. He says: "It looks good, as is, but knocking down Blue Gain a bit improves the picture with a minimal loss of lumens." I found his recommendation to work well, though I left blue alone, and it looked fine watching some March Madness basketball.
