Originally Posted by Nudgiator
Most professional calibrators use GAIN and OFFSET at 80/20 or 80/30, also on the JVCs. The reason is very easy: they are too "lazy" to calibrate the JVCs via the gamma equalizer. The second reason: you must know HOW to use the gamma equalizer in the HD350. Sure, it will take some time (and most calibrators won't spend that time), but the result is MUCH better than using only GAIN and OFFSET. Again: a digital projector doesn't need OFFSET controllers !
"Time consuming" for a professional (time = money), but surely not for a private user.
You have yet to offer any reason for why one should not use the Offset control, other than it should not be used to excess, which is generally true for most controls. I would suggest that if you wish to continue to participate in this thread that you resist the temptation to assume without any evidence or provocation that anyone who disagrees with you is simply lazy or uninformed.
For your information, I happen to be a "private user" of the RS45. Pros also have other assets other than laziness and stupidity, such as wide experience on a lot of displays, very sensitive and expensive equipment, and a reputation to protect.
To bring a little information to this discussion.Pre-CalibrationPost-Calibration (Gains Only)Post-Calibration Gains and Offsets
The Offset adjustment required was very small--only a single tick in either direction. All that remains is a point adjustment at 10%, as I had said.
Now the gamma is screwed up (this is with a 2.4 preset), and if you have no other tools then you will have to use the custom gamma White adjustment for that purpose, but it is not necessary for white balance.
A few caveats here.
Edited by TomHuffman - 10/4/12 at 8:12pm
- I don't think I have worked on two JVCs that measured the same. This partially due to the fact that the bulb changes its spectral characteristics rather dramatically as it ages. Mine measures completely differently than it did when I bought it, and I only have 145 hours of use.
- I suspect because of cost-cutting, the quality control on the newer units is worse than on the RS-25/35 series, which were the best of the RS series.
- If you use the custom gamma controls to improve the gamma response, then this will change the white balance, so that will have to be re-calibrated. In fact, you may have to use the RGB controls in custom gamma after all simply to get good results after you have used the custom W control to correct the gamma response, but that is a whole different discussion.