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16th June 2019, 16:29 | #1 | Link |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,493
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Dithered images look bad on my monitor - any idea why?
I've been experimenting with ordered dithering, but I've run into a weird thing where my laptop screen exhibits banding when I view a dithered gradient image at 100%.
Here's an image: If I zoom in higher than 100%, even as little as 105%, the banding (which is like thin brighter or darker stripes) disappears. I can still see the effect when I ramp up the levels of the dithered image: The banding shifts if I nudge the image around my screen a pixel at the time. Does anyone know what's causing this? I'm pretty sure I've disabled all colour corrections and stuff, and there's no sharpening or anything, but it's still visible. It's a Dell E6520 laptop with an UltraSharp FHD screen. |
16th June 2019, 16:55 | #3 | Link |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,493
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Windows 7. What's Windows is putting on the screen is fine, so if anything is being changed it's being done by the graphics drivers (complicating matters, it's an Nvidia Optimus system so it has Intel and Nvidia working together). Or it's some intrinsic limitation in the screen itself.
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16th June 2019, 23:19 | #6 | Link |
Registered User
Join Date: Feb 2002
Location: San Jose, California
Posts: 4,406
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Is it pixel inversion or a similar issue?
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17th June 2019, 17:32 | #8 | Link |
Formerly davidh*****
Join Date: Jan 2004
Posts: 2,493
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I don't think you can ever really disable the Intel graphics, and the Nvidia only chips in when it's asked to.
In any case, after a bit of intensive research (Googling) I found out that apparently Intel on laptop screens is known for banding due to the way it dithers, and I found a nifty utility to allow you to control the dithering: https://kawamoto.no-ip.org/henteko/myapp_en.html (search for "Dithering Settings for Intel Graphics") Setting the dithering to "Spatio-Temporal 1 (better color)" (from the default of "Spatial (default)") almost completely fixes the problem, at the cost of some barely perceptible flickering. Last edited by wonkey_monkey; 17th June 2019 at 17:47. |
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