Originally Posted by adsl-ryoga
I've just received my replacement AF9 TV and I'm planning to have it calibrated by an ISF calibration specialist.
There are a couple of things I'm interested in or worried about:
- once calibration is completed, is there anything specific I need to look out for? (like increased posterization artifacts, elevated blacks and more image noise)
- for HDR: will the calibrated color and gamma stay equally accurate when content is displayed in varying luminance-levels? Or to put it differently: will a scene at 100 Nits, which is confirmed to show correct color and gamma values, still exhibit correct gamma and color when shown at 1000 nits? This is probably a noob-question, but it has been occupying my mind lately
- what is your experience concerning Sony's newly implemented CMS, is it usable without side effects?
Thanks and best
After the end of your calibration, for SDR display some Contrast/Brightness/Color Clipping and some patterns (from your movie source player) with gradation (grayscale/colors) to see that all are fine, also check some familiar to you content.
Generally its been reported from field calibrators that works better the AutoCAL of Grayscale and then manual cal of CMS (but when your calibrator it very expert, he can perform manual cal of grayscale which can provide better results, but take a lot of more time from him to finish that task compared the quicker AutoCAL procedure of grayscale)
Your calibrator will calibrate the picture mode where the TV based to that gamma based calibration will add the offset for you to have calibrated the HDR modes also.
For HDR10, Contrast/Brightness/Color Clipping pattern should be used only for evaluation, not for any adjustment.
Sony AF9 is doing frame-per-frame analysis with HDR content and dynamically adjust the tone mapping, generally with WRGB you can't have 1000 nits displayed to your screen (about 600-800 nits are possible) and also because of WRGB design you have lower color gamut than from an RGB panel, as explained very detailed here
, the WRGB OLEDs due to the introduction of the 'white' sub-pixel, it distorts the standard RGB color channel relationship - excessively at HDR brightness levels. (if you sum the Y of 100% Saturation with 100% Luminance color patch of R+G+B primaries you get 400nits while the same time if you display a 100% White patch you get 800nit...so your color gamut is limited to 400 nits... this means that WRGB OLED's can never be calibrated for HDR for the level of accuracy is possible with SDR calibration.
Sony is very smart by introducing that kind of calibration procedure, where you calibrate the SDR mode (where the panel is more stable over the time than in HDR mode where its very unstable), so while it saves a lot of time (reduce calibration time required), you have calibrated at the end all modes based to that SDR calibration as baseline.