Originally Posted by ThomasCro
It's a BenQ GW2765.
I'm not using any additional equipment, just playing the APL test and adjusting the brightness and contrast.
No matter how much I change the settings it always shows all the bars visible, it just gets a bit darker and lighter as I adjust the brightness.
The monitor is connected via DP to the graphics card.
The pattern you are using has values for video level calibration where digital level 16 is the reference black and 235 the reference white, these levels called TV Legal Range.
PC are using Data Range, 0 is black and 255 is 100% White.
Do check your black/white levels for clipping you have to use a pattern for PC Levels, not that one you are using.
There no solution for displays where they are adjusting dynamically their backlight, your total output levels and pattern window will affect the APL.
The patterns you may check for contrast/brightness, you only check your near black/while details clipped etc.
Monitors don't have so much calibration controls to fix calibration errors.
You will need a meter and software to be able to fix you RGB balance and gamma errors (via windows VCGT calibration ) or color errors (via ICC).
Usually PC monitor have a Brightness control (and confuse people where they will use that control to adjust with a brightness pattern) which is basically a backlight control, while TV's name Brightness control the one where you control your black level (and you can use for adjust a brightness pattern) and have separate control for backlight.
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