Originally Posted by WiFi-Spy
DV Cinema Home is intended as a bright room mode and will not track PQ properly. If you do the same calibration in DV Cinema mode, then it will track correctly.
1: On my C9 both Cinema modes seem to behave exactly the same after a fresh DDC Reset or after a full calibration (to the same targets, obviously: the CalMAN defaults for the LG DV workflow [D65, g2.2], and of course every other TV user settings matched between the picture modes). The initial difference seems to fully disappear with a DDC Reset.
2: As I mentioned above: the regular Cinema mode (in it's factory default state, no less) measures just about the same as the calibrated Cinema Home mode. You can see I had an extra History tab open on the tone-mapped gray-scale verify charts (although I didn't post the screenshot of History2) - that is for regular Cinema.
But DV pre-cal also shows regular Cinema measurements because I didn't care to measure the factory state of Cinema Home before the Reset (since I know it's a custom "day mode" by default), I only went back to do some extra measurements after I noticed something is not right (during post-cal measurements). This is why pre-cal and post-cal charts are so very similar: the only difference is the slight adjustment to the display panel gamma response and the config file by AutoCAL (1DLUT + config file). But it's a well-behaved display panel, so the calibration doesn't make a big difference.
Right now, the calibrated Cinema Home looks really close to the factory default Cinema (save for the obvious black crush with post-marcro-block LG firmwares in default factory state which is not unit-specific but LG's fault in general) and both measure much further from the reference tone-curve than expected.
This difference is magnitudes higher than whatever is expected from the 1DLUT calibration of the gamma 2.2 response (and the pattern source was the same PC between HDR10 and DV, so HDR10 post-cal should be similarly flawed if the error was on the source side).