Reduced-Contrast Trick To Reduce Strobe Crosstalk / Ghosting

Ask about motion blur reduction in gaming monitors. Includes ULMB (Ultra Low Motion Blur), NVIDIA LightBoost, ASUS ELMB, BenQ/Zowie DyAc, Turbo240, ToastyX Strobelight, etc.
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Reduced-Contrast Trick To Reduce Strobe Crosstalk / Ghosting

Post by Chief Blur Buster » 07 Feb 2019, 23:56

You've lowered refresh rates, you used other tricks, and you managed to make framerates permanently match refresh rate (framerate = stroberate = refreshrate) via the various low-latency VSYNC ON techniques.... But still hugely bothered by strobe crosstalk? And you're looking for an additional method of further reducing strobe crosstalk? Here it is!

Instructions for dynamic range reduction for reduced strobe crosstalk

Follow these instructions ONLY if you're unsatisfied with all your monitor's overdrive

First, configure your monitor to the least-worst overdrive setting.
(or perhaps slightly more corona than your preferred overdrive setting, you may need to repeat these instructions at different overdrive settings for best results).

Next, you need to digitally compress your color range without touching the monitor's backlight.
Overdrive has biggest problems with the brightest colors.
So you trick the monitor to avoid ever using the brightest colors.

1. Go to NVIDIA Control Panel -> Adjust Desktop color settings -> Use NVIDIA settings -> Slide both "Brightness" and "Contrast" downwards in NVIDIA Control Panel.
2. They both default +50%.
...Lower both to same settings if you only want to chop the top end of your color range.
...Contrast should be slightly lower than Brightness if you're chopping both ends of your color range.
3. Play the sliders while watching http://www.testufo.com/ghosting

The final settings would be closer to usually Brightness=+40% and Contrast=+30%. Or try Brightness=+30% and Contrast=+10%. The exact numbers will be a personal preference, and depend greatly on the display.

This brightens your blacks and darkens your whites without touching your backlight, forcing the monitor's overdrive to avoid the most problematic ghosty pixel colors.

- This range-reduce trick works best in conjunction with middle-setting overdrive (e.g. "BenQ AMA High" rather than "BenQ AMA Premium")
- This range-reduce trick works best with VRR displays with true dynamic overdrive (e.g. true native NVIDIA GSYNC)
- This range-reduce trick will also reduce strobe crosstalk if you use blur reduction modes (ULMB, ELMB, DyAc, etc)
- This range-reduce trick will, to a lesser extent, partially help non-dynamically-overdriven FreeSync monitors too.

There are cons, like worse colors and reduced contrast ratio, but sometimes the "contrast-loss" of 5% for a "ghosting-disappear" of 75% for some models, and sometimes a worthy tradeoff, on certain models.

This is not a 100% solution and will not erase all overdrive problems but can "dim" bright coronas by 50%-90%, making them between half-visible to tenth-visible, depending on monitor. And text scrolling can suddenly jump from ghosty to perfectly clear.
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