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Odd rainbow effect viewing fine text on TV |
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#1 |
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Forum Member
Join Date: Dec 2000
Location: Teesside, England
Posts: 2,898
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Odd rainbow effect viewing fine text on TV
I use a 4K UHD TV as a large monitor for my PC with a small 1080P monitor as a second screen. I find the picture on the UHD TV is generally good but have recently noticed that it seems to have light colour artefacts when resolving very fine details. It happens most consistently on very small black text on white background where there is a fairly faint but visible rainbow effect around the text as if the colour is somehow ‘leaking’. The effect doesn’t happen on larger text, just small text, but it can still be distracting at times. For comparison the regular 1080P monitor I have as the second screen doesn’t have this problem at all.
This image shows the effect that I see on the black text, you can see it in the white window where I have right clicked: http://i236.photobucket.com/albums/f...psqn9rmxiu.jpg In particular, I was wondering is it likely a fault of the TV? Or likely that I have the TV settings wrong? Is it simply a limitation of using a TV with a PC instead of a monitor? (though I would have thought a 4K screen could resolve the finest detail easily) or a mismatch of colour space settings between the PC and screen? Any advice appreciated Thank you for reading. |
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#2 |
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Join Date: Jun 2003
Location: Cheshire
Posts: 6,450
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Would it be an LG 4K screen by any chance?
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#3 |
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Join Date: Mar 2006
Location: Scottish Borders
Posts: 11,989
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Judging by the size of the text compared to the size of the screen, it looks like you have set it to have a large text size?
It looks like the TV isn't showing the scaled up text very well, as the text on the rest on the screen seems fine. So it might be the computer isn't scaling the text well, or the TV isn't handling it well. If you set the text scaling to 100% do you get the same artifacts? And is it a cheap set? |
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#4 |
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Forum Member
Join Date: Dec 2000
Location: Teesside, England
Posts: 2,898
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Quote:
Would it be an LG 4K screen by any chance?
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#5 |
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Forum Member
Join Date: Dec 2000
Location: Teesside, England
Posts: 2,898
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Quote:
Judging by the size of the text compared to the size of the screen, it looks like you have set it to have a large text size?
It looks like the TV isn't showing the scaled up text very well, as the text on the rest on the screen seems fine. So it might be the computer isn't scaling the text well, or the TV isn't handling it well. If you set the text scaling to 100% do you get the same artifacts? And is it a cheap set? |
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#6 |
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Forum Member
Join Date: Dec 2000
Location: Teesside, England
Posts: 2,898
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One more thing i just considered is it possible the pc could be running in compressed colour mode, 4:2:0? I have read that this may be getting selected as a fall back https://m.reddit.com/r/nvidia/commen..._rgb_4k_60fps/
It sounds like this could cause the issues im having. I think it is used to save bandwidth so hdmi 1.4 can run 4k at 60hz though as my tv and gpu (gtx1060) are both hdmi 2.0 so it should not have to 'fall back' to 4:2:0. Is there anyway i can check to see what colour space is being used? |
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