Optoma GT720 Projector Review
We calibrate every home theater that we review. The Optoma GT720 received the usual treatment. I “played” with the GT720 for a couple of days, passed it off to Mike for calibration and measurements. 24 hours later, I’m back to watching it.
Ours is a pretty standard calibration, there’s always more done by some of the “hi-end” calibrators. Our calibrations, including the Optoma GT720, are normally limited to a grayscale calibration, along with brightness, contrast, color saturation, etc. Only in very special circumstances will we calibrate the individual colors, in which case we discuss why.
Optoma GT720 Color Temperature
Before we provide our settings, lets see what we started out with: Pre calibration, these are the color temperatures over the grayscale range:
|Color Temp over IRE Range (Best Mode, Pre calibration):|
Standard offered the best looking color, but produced a very cool (bluish) image.
|Lumen Output and Color Temp at 100 IRE (mid zoom):|
|Brightest||1653 @ 7232|
|Standard||1529 @ 7718|
|Theater||1296 @ 7891|
|Dark Room||839 @ 7993 (By default, Dark Room is on Eco lamp. With Eco off, Dark Room has same lumens as Standard)|
|User 1||1108 @ 10280|
|User 2||1108 @ 10277|
NOTE: There are three other color temps in addition to Mid, but Mid gives the highest lumen output.
|GT720 Brightness (Eco Lamp On, Brightest mode)||1306 lumens|
That represents a drop from 1653 lumens at full lamp power. The math says that’s a drop of an almost perfect 21%. Most projectors drop 20 to 25% when going to their eco – low lamp, power mode.
Optoma GT720 Basic Settings
|Settings for measurements (default values are in parenthesis):|
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.
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