4K HiDPI on 4K display? #4513
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Hi there, I have a 42" LG C1 4K display I use as a monitor with an M4 Pro Mac Mini. Native 4K resolution is actually a perfect size for UI elements on this display, but text and other elements are very grainy due to the lack of HiDPI. In an attempt to get better text etc on my 4K display at roughly 4K scale, I'm thinking I should have macOS render at a higher resolution so that 4K HiDPI is the result. Am I understanding Retina scaling correctly? Is this a path that makes sense? As other threads have suggested, I've tried mirroring a virtual display at what I assume to be the correct resolution (7680x4320) and the best looking option is 150% (3840x2160) when I choose HiDPI. This seems weird to me as I though Retina was usually 2x. Not sure why 100% shows 2560x1440 on the virtual display. Choosing 7680x4320 disables the HiDPI option and yields very small elements with grainy text. Should I be trying to modify the native pixel resolution of my display instead? Or modify the EDID? I'd assume this would create timing problems. Or maybe LoDPI is what I'm actually looking for due to pixel doubling? Any input would be great. Thanks!! |
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Replies: 1 comment 3 replies
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Hi there - at a 55" size to get a proper HiDPI image, you’d need a 8K display (I am using a 55" Samsung 8K display as a monitor on one of my setups - that can produce 4K HiDPI with perfect pixel mapping). Since the 55" LG C1 only has 4K, creating a 8K virtual screen running it at 4K won’t help much (if at all) as this will simply create a 2x supersampled image, each logical pixel mapping to one physical pixel, and the 4 framebuffer pixels of a logical pixel averaged down to 1 physical pixel, so the image quality will be the same as 4K LoDPI. |
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Great insight, thanks. If your 8K is OLED, do you find the text rendering to be better with the greater pixel density? I'm pretty annoyed by the inherently somewhat blurry text rendering on this (or maybe most) OLEDs and that's the problem I'm trying to solve with the supersampling. |
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Sorry, it's mini-LED, not OLED (I don't think there is a 55" 8K OLED panel - that would be great). With the LG C1 WOLED subplixel layout should not be as bad as some other, but still not ideal. However since macOS does not have subpixel rendering anyway, it should not matter that much. The issue is simply the pixel density imho. For a 55" screen at about 1-1.5 meter away 8K should be an ideal resolution, 4K would not look very sharp even with a LCD screen using a perfect RGB subpixel layout. |
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The upgrade quest continues LOL |
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Hi there - at a 55" size to get a proper HiDPI image, you’d need a 8K display (I am using a 55" Samsung 8K display as a monitor on one of my setups - that can produce 4K HiDPI with perfect pixel mapping). Since the 55" LG C1 only has 4K, creating a 8K virtual screen running it at 4K won’t help much (if at all) as this will simply create a 2x supersampled image, each logical pixel mapping to one physical pixel, and the 4 framebuffer pixels of a logical pixel averaged down to 1 physical pixel, so the image quality will be the same as 4K LoDPI.