Acer Nitro XV273K, strange behaviour during calibration with colorimeter

sblantipodi

Hi all,

I'm trying to correctly calibrate my wide gamut 

Acer Nitro XV273K

using an X-Rite i1 display pro colorimeter and i1 profiler software.

Something strange happen on this monitor that I never experienced before on other monitors.

I can easily achieve 6500K moving the Red or Blu gain but moving the Green gain seems to not influence the measured color temperature even if I can see the temperature changing with my naked eyes.

This is bad because I have one gain control less to achieve the temperature I want. It's like calibrating the monitor using red and blu only.

Why I have this problem?

Please help.

Thanks

sblantipodi

no one can help here?

AstralStorm

The RGB controls are weird. Ultimately you would have to really dial down Red and some Blue to hit a 6500K visual white point in custom mode, like 33/50/46 or thereabout. Funny enough CCT is good but VCT is off the charts unless you do that. The shown color in say DisplayCAL calibration is the VCT and changing green won't change it as it's off due to Red/Blue.

It calibrates well regardless if you use the gain controls or not.

Additionally the monitor has some sort of ABSL (backlight saving) variant in HDR mode that runs on temperature control, but is completely busted - instead of reducing brightness it changes gamma curve to the lower one - so you get a 120 nit white reference curve, brighter darks... It can run forever in this mode hitting some ~40 C, so Acer should probably just switch the mode to always use 400 nit curve and disable the silly feature.

sblantipodi

my monitor achieves 6500K with 
R=44
G=50
B=44
but the gain question remain unanswered.

Why green gain doesn't contribute to the color temperature in color calibaration software even if I see the temperature changing with naked eyes?