Posted on April 22, 2015 By Art Feierman
Mike completed the CMS calibration of the individual primary, and secondary colors, which are provided below. And, of course, some additional comments from him about that aspect of the calibration.
The changes to the individual colors in all cases are very modest, as Mike points out below.
Like gamma, many of the color profile settings have been renamed to correspond to the picture modes. With the exception of the THX color profiles, each expands the gamut to varying degrees over the standard Rec. 709 color space. Though the THX color profile is not available as a choice for the other modes, the Custom 1 color profile is almost identical to THX. If one didn’t have to ability to do a CMS calibration, simply changing the color profile to Custom 1 would suffice.
As a result of the good color space accuracy in Custom 1, using the CMS results in fine tuning that is not easily discernable to the eye. The Saturation controls were of little value for increasing the saturation, but since the chromaticity error never exceeded 3%, it’s not much of an issue. Overall, the color balance is so good that only minor tweaking with the CMS is necessary.
This is the Standard mode CIE.
This is the CIE chart for the THX mode, which is much closer to ideal than the Standard.
This CIE chart shows that the JVC projector is pretty close to dead on the money, post calibration.
You can see the higher Gamma in the low ranges, which may explain the overly intense colors in very dark ranges. The overall Gamma is an excellent 2.18, if set for Custom 2.4.
Due to that oversaturated look, I recommend instead, using 2.2. That will give a lower overall Gamma, slightly lower (brighter in the mid-ranges) than ideal, but seems to solve much of the overly intense colors in very very dark objects (noticeable in very dark scenes).
Grayscale looks very well balanced, post calibration, but the cool lower ranges are visible – by the high blue at 20 IRE.
None the less, overall, picture looks great, including skin tones. Or perhaps I should say – look right! (Again, except for that slight issue on very dark scenes.)
For comparison, to the post calibration grayscale image, here’s THX mode, “out of the box”. Note that the lower brightness ranges are very warm – too much red. Now that is “easily visible” when viewing. Mind you, though, the miss is not that great, only about 500K. Still pretty darn good.
Folks, that’s why good projectors can become great projectors by calibrating them.
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