Originally Posted by Chris Campbell
No, this is showing only 4:2:2, as it's supposed to. I have a 4:4:4 capable LG that shows it correctly, and it's quite different - the "4:4:4" on the bottom is a much darker shade than the background, and the "4:2:2" at the top is very difficult to read. Not at all like the photo you're showing. Can you try this same image while outputting 4:4:4? See if it looks different.
I admit I'm stumped regarding your first set of images. I can't reproduce what you've created there - I get color bleeding on text even if I'm sending 4:4:4. Regarding your comments about scaling and bit depth, I'm afraid I'm not sure quite what you're arguing. If EITHER of those are the issue here, the problem is much worse than a simple lack of 4:4:4 chroma support. Bit depth is very obvious if it's off, and it's no different for the Vizio than any other set given the same 32 bit input from your graphics control panel. If you're suggesting that the Vizio just can't scale the image properly, then the entire image would be soft when displaying a desktop. But over/underscan would not flip flop the test image results for some reason. It's the color, not the sharpness or scaling that's inverting the image. Frankly, if the issue were that the Vizio isn't scaling correctly, then this would be unusable as a PC monitor regardless.
I agreed with your assertion that a lack of 4:4:4 chroma for the Vizio isn't a critical issue for the majority of users, and probably not noticeable in many use cases. See this thread for a more in depth discussion of this: https://www.avsforum.com/forum/166-lc...ng-thread.html
It's somewhat dated, but no less relevant today.
I'll get off the stage now and let everyone else figure this out. For my purposes, I'm satisfied with my Vizio set, regardless of whether it can or cannot do 4:4:4.
The problem is that the test pattern has more going on with it than just 4:4:4. That test pattern is specifically designed so that if any one of the following items(4:4:4, Bit Depth, 1:1 pixel mapping, and color gamut) are not aligned with the input material the display will fail the test. It is designed to determine if a display can be used for critical image editing or not instead of just testing for general computer use.
The Vizio Displays have the lowest color gamut of all of the current 4K TVs. They all barely register above the REC.709 specification. Therefore, it passes the 4:4:4 chroma subsampling portion of the test pattern but fails because it can’t cover the colors that the test pattern is encoded with. That is why the 4:4:4 and 4:2:2 are visible simultaneously but the colors are not correct.
In addition I have never seen confirmation either way whether the Vizio M-series is 10 bit or not. Everything posted so far has just been conjecture based on what someone else has said. I have never seen any evidence either way to demonstrate what it does for bit depth. This is could also be another factor in why it is 4:4:4 but does not pass that specific test.
I am not saying that the Vizio M-series produces the exact same image as the Samsung TVs when hooked up to a computer. In fact I am saying the exact opposite. The Samsung SUHD TVs all cover a much broader color spectrum than the Vizio TVs. In addition they are definitely at least 10 bit as well as 1:1 pixel mapped.
For critical image editing the Samsung TVs would be the only option but not just because they are 4:4:4.
What I want people to realize is that the test picture is designed to demonstrate whether a TV can be used for critical image editing and not whether it can be used for general monitor use. All you need for general monitor use is 4:4:4 and I have shown that the Vizio TVs can do that.
If you aren’t doing critical image editing you don’t need a TV that passes that all-encompassing test pattern. You just need a 4:4:4 4K Display.
I really want everyone to recognize what each individual component is important for instead of just following a blanket stereotype that if it doesn’t pass that particular test it is useless.
So many people believe that the Vizio TV is not 4:4:4 capable yet they can’t see any issues at all when they use the TV hooked up to a computer. That has caused some people(including myself at one point) to say that 4:4:4 isn’t critical for computer use when in fact it is truly the most important component of those I listed for general computer use. Without 4:4:4 there will be extensive color bleeding along contrasting edges that is visible from all reasonable distances.
The Vizio TVs don’t exhibit any of the issues that are associated with 4:2:2 or 4:2:0. However, they most certainly exhibit the issues with the reduced color spectrum and in all likelihood they probably also have issues with bit depth as well.
That doesn’t mean that they can’t be used for everything but critical image editing though.