Why does my Mac think my 32" monitor is a 27"?

[jck1634]

has anyone else seen this? I don't know if this is normal or not and just noticed it. I've got a 32" monitor and macOS seems to think its a 27" I've tried with a few different scaling options and it doesn't change it. Any one else had this?

 

[Amethyst1]

I’ve had this happen too — no biggie as long as things are still working properly.

 

[velocityg4]

It probably goes by the resolution and assumes a size or is going off a database with an incorrect entry for the hardware ID being sent by the monitor.

 

[Amethyst1]

A monitor's EDID usually contains a timing with a horizontal and vertical image size; for example, for my 21.3" LCD, horizontal size is 422 mm; vertical size is 337 mm. Using the Pythagorean theorem, (sqrt (42.2 ^ 2 + 33.7 ^ 2)) / 2.54 = 21.26 inches, which macOS rounds up to 21.5 inches.

 

[jck1634]

A monitor's EDID usually contains a timing with a horizontal and vertical image size; for example, for my 21.3" LCD, horizontal size is 422 mm; vertical size is 337 mm. Using the Pythagorean theorem, (sqrt (42.2 ^ 2 + 33.7 ^ 2)) / 2.54 = 21.26 inches, which macOS rounds up to 21.5 inches.

Wow! have no idea what any of this means but I'll take your word for it because the math looks impressive!

 

[Amethyst1]

Wow! have no idea what any of this means but I'll take your word for it because the math looks impressive!

It’s just my guess how macOS might try to work out what size your monitor is. The numbers add up at least