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Optoma HD37 Projector - Advanced Calibration Information

Posted on July 2, 2015 by Art Feierman

Color Management Settings

Color Management Settings (Default is 0 UNO)
Red Green Blue Cyan Magenta Yellow
x Offset 1 -16 -4 0 -17 -18
y Offset -2 -22 -39 -50 -26 8
Brightness -33 (-12) -20 -30 -11 -31 (-3) -9


Mike's CMS Calibration Notes

The HD37 has Color Gamut settings that allow the user to set different color spaces as required.  By default, every mode uses Native color gamut, except for Reference, which uses HDTV.  Native and HDTV are very close in their gamuts (see CIE charts), but both have Brightness settings that are way too high for Red, Blue and Magenta.  Fortunately, the CMS, has enough range to correct both the Brightness issue and the colors that are off their target in the color gamut, with the exception of Cyan, which even with full adjustment is off in Hue.  With the exception of Cyan’s hue, every color was brought to within a chromaticity error of less than +/- 3%.  Overall, both the default and CMS-adjusted color gamut represent a big leap forward from previous models in this price range.

Calibration Charts (Before and After)

Click to enlarge these charts, pre- and post-calibration.

Optoma HD37 CIE Chart Pre-Calibration (Native)

Optoma HD37 CIE Chart Pre-Calibration (HDTV)

Optoma HD37 Chart Post-Calibration (CMS)

Optoma HD37 Grayscale Chart

Optoma HD37 Gamma Chart

HD37 Calibration Summary

The final results of Mike's calibration of the Optoma HD37 resulted in a very good overall picture.  His efforts, however still left a tinge of yellow (or perhaps yellow green) in skin tones, and a very slight shift (toward yellow) in a typical blue sky.

I would expect that further tweaking and adjusting, could eliminate most or all of that shift.  My own brief attempts, however, to correct via minor adjustments to the grayscale balance did not yield results.

I believe the minor fix will lie somewhere in the color management system.  But then, I have only dabbled in calibrating projectors over the years.

Those of you with your own gear should be able to get that last 5-10% right, by investing a little extra time.

For those of you just plugging in our settings, you should still have generally very good color accuracy, and a well balanced picture, but for that minor shift.

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