Originally Posted by Larry Hoffman
Bob, I was told you would be able to advise me about this. I'm wondering what colour setting to use on my Panasonic 460 with dual HDMI. I'm using both, so I can watch 3D blu rays without having to buy a new receiver. My Pioneer 1018 is still doing all I require.
I changed it to 4.2.2 from 4.4.4 because that is what the Spears & Munsil disc mentions as the default setting.
Is there an advantage to one over the other, or does it depend on the TV or Projector you are using? I'm using an Optoma HD30b projector.
Should I keep deep colour on as well? It was mentioned I should maybe turn it off??
This has been discussed several times. If everything is working correctly, there is no reason to prefer any of the three output formats: YCbCr 4:4:4, YCbCr 4:2:2, or RGB Video Level. (RGB PC Level should not be used unless that's the only format that works with your display.)
The PROBLEM is that many displays have quirks (read bugs) which cause them to work better with one format or another. Since we're talking bugs here, there's no logic to it. You just have to try the three formats and see if you can find a reason to prefer one over the other.
YCbCr 4:4:4 is the "default" format choice for HDMI to HDMI connections.
As for Deep Color, there is no Deep Color content out there, so the only point of using Deep Color (more than 24 bits per pixel) is that the rounding results in the lowest order bits coming out of video processing can be passed along the cable to the display. Some displays actually try to use those bits. Many displays simply clip those bits off as the first step on input, so there's no point in sending them. *ALL* displays have to trim down to fewer bits before the last stage of video processing (i.e., as the pixels light up) because the pixel elements don't have the ability to render such tiny differences distinguishably.
So the point is, *AT BEST* the "real" value of enabling Deep Color is subtle -- so subtle most folks will have trouble seeing it.
HOWEVER, that ignores the possibility of bugs! As it turns out, some displays DO work better with one or the other of the Deep Color choices. If you see substantial (not subtle) improvement in the video for some choice of Deep Color that simply means your display has a bug like that. It gets even more complicated if the display reacts differently to, say, 1080p/24 video input vs. 1080p/60 input.
So the bottom line is that there is no pat answer, and the only practical approach is to try all the combos of Color Space (excluding RGB PC Level) and Deep Color and see if you can spot a reason to prefer one or more of them over the others.
The types of display quirks (bugs) I'm talking about generally are not possible to spot using normal calibration charts. HOWEVER, before you can compare combos of Color Space and Deep Color you absolutely have to START with the calibration charts and make sure the video level settings in your display are correct for each combo. Why? Because one of the types of quirks you can run into is Displays that need DIFFERENT level settings according to which video input format is coming in.
Once you know that you've got all the combos equally well calibrated (possibly by having to make setting changes in the Display when you switch to one or more of the combos), then you can start comparing scenes to see if you can spot a reason to prefer any of the combos.
There's a scene I like to use in Chapter 10 of "Ratatouille", Blu-ray. It's just after Linguini, at the river, pulls the rat in the jar off frame leaving just an image of the night sky viewed through lit fog. You can Pause at that instant and study that frame carefully. It is a very complex color and luma ramp created out of digital animation patches. If you deliberately mess up your video settings you'll see just how complicated it is. And it is very tough to get things set "just right" so that all that structure vanishes and you see just a completely smooth ramp of colors and brightness. I've found that frame to be pretty revealing of the sort of rounding errors that indicate issues in Display handling of the various combos of Color Space and Deep Color settings.
If you can *NOT* see a reason to prefer 30 or 36 bit Deep Color in combo with your preferred choice of Color Space, then I strongly recommend you leave Deep Color set to OFF. Why? Because that puts less bandwidth on the HDMI cable, which means you are less likely to have occasional HDMI handshake problems.
NOTE: The newer Spears & Munsil v2, Blu-ray, calibration disc (available from OPPO) has some charts you can use to spot common issues in the way Displays handle the different Color Space choices. That can reduce the number of combos you need to check with real content tests, like the Ratatouille scene.