Hi, I'm new to the forum! Sorry in advance, since this is my first post, I can't display images directly in the post, please see the attached images below.
I did some testing and it seems the Apple TV 4K, when configured with Match Content (Range & Frame Rate), will output 12 bits & 4.2.2 & HDR10 when playing [email protected]
HDR content for the Optoma Cinemax P1. However, the projector doesn't seem to accept this output and will "convert it" to HDR 8 bits & 4.2.2 according to the Input Source Information Menu. This results in color banding that can be noticeable depending on the scene.
I'm not sure how the projector is displaying 8 bits color depth since HDR10 is, to my understanding, 10 bits. According to the projector datasheet, it should be able to accept 12 bits & 4:4:4 or 4:2:2 when playing [email protected]
Surely, it should be the able to handle HDR content @24Hz and give a better result since color banding is a lot less noticeable on SDR content. For example, almost no color banding was perceived on Blade Runner 2049 'Ruins of Las Vegas' Scene (SDR version) on Netflix.
The testing was done using S1:EP1 of Altered Carbon (HDR title) on Netflix using the projector on a white wall (sorry for the quality, I do not have a screen yet). The Apple TV output was measured using a Denon AVR-X3600H which can display HDMI signal information from the source.
At 34:59, you can notice color banding in the sky.
The test was also done after resetting the Apple TV to default video settings. This removes any Match Content settings and defaults to an HDR output for all content, which is not "acceptable" but was done for the sake of testing purposes. In this case, the Apple TV is sending 10 bits & 4.2.0 and the same is displayed by the projector. However, the color banding is still visible, I see almost no difference.
Finally, I forced SDR on all content by changing the Apple TV video format setting. This resulted in 8 bits & 4.4.4.
The color banding was greatly reduced to my eye. However, HDR was lost.
The test was also done using the Apple TV directly connected to the projector (without an AVR) and the projector still displayed color banding with HDR 8 bits & 4.2.2 when using Match Content settings.
I did some limited testing on Prime Videos HDR content with the same results.
HDMI cables are Amazon Basics High-Speed 4K HDMI Cable (3 foots). I'm waiting for certified high-speed Monoprice HDMI cables to do another batch of test, but I do not have high hopes it will change the results.
Was anyone successful at outputting better color depth and chroma on HDR content while using the Match Content settings on their Apple TV 4k? I will probably open a ticket with Optoma support to see if this is a bug.