Originally Posted by woofer
For the moment , stay with the "Beta" firmware.
Once the public version is installed, there is no way to regress, correct?
I wanted to reference two 203 observations i have made, which might contribute to what is being observed with tge color tracking.
1... when using the rm uhd white clipping 1 test pattern, i am observing some form of gamma processing which lowers the luminance values of the test pattern on the projected image. Switching between target ranges on the 203, briefly sends the proper values, but they quickly adjust lower.
I remade that white clipping pattern and made it smaller in the frame. At a certain size and less, the processing no longer happens, and the luminance value steps in the pattern remain constant, even when switching between target ranges on the 203.
This observation can be similarly demonstrated with the dynamic contrast test rm uhd pattern, when the background is at a 40% value or less.
2... I used the full screen rm uhd color bars ramp, and as others have observed, red and green fall short on the 203. Further, some of the primary and secondary colors exhibit a "curve" thru the luminance range. The curve is made worse with any hue or saturation changes to the individual colors. The curve is mostly on the top end, going in different directions, depending on the color.
When i reduce the size of the color bar ramp test pattern in the frame, like i did with the white clipping pattern, the color track peak values improve. Its still not as good as hdr, but it is better.
My conclusion... the 203, in order to accommodate bending the gamma curve on the top end, applies processing when the scene apl starts to move above 50%. Maybe the x990 is also doing something when switching quickly from a low to high luminance value, but what the 203 seems to be doing is different.
I have yet to try adjusting for extra color saturation other than on the x990. But i found setting the x990 master color = +10 gets me closer to red and green targets without noticeable artifacts on content.
Aside... i have been using an external camera connected to a waveform and vectorscope, as a better option than going by eye. This LIVE camera scope combo is by no means meant to replace the use of a calibration probe and software . However it does provide for better live source comparisons. As such, it has allowed me to use the combo to measure and map one source, and then overlay an alternate source, in order to make x990 setting adjustments. That is how i was able to arrive at the x990 hdr recommendations that are close to a few x990 203 hdr off bt2020 settings. As i have noted, the x990 on board hdr gamma controls are inadequate to get an accurate 2.4 gamma track. But my recommended settings are close, with the upper part of the curve bending out to the left of the 2.4 track. Certainly not ideal, but not a bad compromise until owners can move to the next level.
So, I'm watching the discussion here and on the 203 thread. I have been meaning to contact oppo tech support, but have busy.