Originally Posted by Light Illusion
Sorry, you have totally missed the point - the problem is the projector clipping the data on input to 64-940 (tv legal levels), rather than passing the full 0-1023 image range.
Brightness and contrast will not bring back clipped image data.
And 'tweaking' a custom gamma curve would totally mess up the image gamma - not something I would ever want to do. Professional calibration requires very, very precise setup, and we use very accurate 3D LUTs and from 1000 to near 5000 calibration patches for this.
We are checking the HDMI settings for 'Auto' and 'Enhanced' to see if this helps. Thanks Kelvin.
I got ya, I misunderstood what you were saying the problem was. You don't say whether checked the "clipping" with the projector's "internal test patterns" also.
Assuming it's a projector problem, have you inquired about it from JVC's U.S. engineering department? While I could have helped you correct a clipping problem on the old chassis' (up to model HD10K) that uses JVC's PSA software for all adjustments and calibration, being retired, I haven't worked on these new chassis' (although I have an RS35 that shows absolutely no signs of clipping), which JVC calls the "digital chassis".
When the new digital chassis projectors came out, I inquired about how service adjustments were made and was told that each major assembly carried its own firmware and came prealigned from the factory. I really don't understand how that works, unless their precision is so tight they can calibrate each assembly with such a narrow high tolerance any replacement assembly can be interchanged.
Even if true, they would STILL have to have some kind of factory jig software to adjust the onboard ROM to begin with. If you are getting clipping on an internal pattern, I would definitely contact JVC. If you decide to contact them, if you PM me I'll look for the engineer I've dealt with at the JVC R&D Center. They don't do any actual service there. If after speaking with them it's believed that it's a projector problem, you would need to take it to an authorized JVC location.
You might also try contacting Wm Phelps (he posts here on AVS), he's a calibrator who has done a lot of work for JVC and Sony.
Good Luck, I hope you get the answer you're looking for