Originally Posted by ConnecTEDDD
Your black also is 1.74 nits, which is very high for JVC.
See why this is happening, somewhere you have levels mismatch of patterns or input settings of projector.
Originally Posted by jimmyp1974
Hi, thank you very much for your support. I have a JVC RS25. I will try again a full calibration and see the results. Or I may adjust only the color temperature for the THX preset which delivers a very accurate color gamut. But to do that I have to tweak in the user menu which is a little risky
About your lifted black (1.74 nits)
The issue you see is related with Input Level setting of JVC, I'm not familiar with your model, but look what is happening with JVC...
There is a setting called 'Input Signal' and probably you have 'Auto' right now, which is the same as Standard when you send signal from a stand alone blu-ray player.
With 'Standard', it top end (headroom, above 235) and low end below reference black, so 16 and below, it will be clipped, it will be impossible to see any flashing bars below 16 or above 235.
The problem here is that if the 17 is not flashing, when you will increase brightness setting to see 17 slightly flashing, you can increase your native black level (since you will not see any flashing bars of 16 or below 16 to flash...preventing you from incorrect adjustment.
With 'Enhanced', you will see everything flashing (top end, above 235 and below 16) but your black level will be incorrect (it will look like 6.3% gray) so you will have to reduce Brightness to resolve. Here you will need meter to do it right. But it can resolve a problem of near black details (of Standard/superwhite setting, if exist a slight clipping of near black detail)...here you will need a meter to see what is your near black level performance, measuring 0.5% / 1% / 2% / 3% / 4% / 5% Gray, evaluating your adjustments decisions/options.
With 'Super White', you will have headroom (top end will flash) but below 16 will be clipped.
See there why you need headroom: LG 2017 OLED Calibration Thread and Settings
When you have a colorimeter, another way to evaluate your near black performance and without loosing your native black level; to find your best Brightness setting which will not lift your black level (reduce your contrast ratio); display any Brightness Pattern and pause when the flashing bars are static.
After that place your meter at the middle left area where you see total black (bars 2-10 as example, red circle stroke to the picture above) and take a black reading with your meter with your Brightness setting @ 0, 1, 2, 3, 4 etc.
Doing this you will find the setting which will not increase your black level while at your right side you will see which near black bars you see at the same time.
A lot of time when users are adjusting their brightness control looking the flashing bars of a brightness patterns, sometimes incorrect adjustment while trying to display 17 bar, it can lift the black level so this will provide poorer black level and lower contrast ratio.