I've never done anything close to the color calibration work, in part because my vision is color-deficient by default, so any tools or processes relying on my own visual acuity isn't going to come out right.

However, I was under the impression that there existed external tools that basically did exactly what you were trying: Taking actual images of the screen in a controlled way and comparing it to physical (or at least a known-good digital) copy of that same image and outputting the "right" profile.

Is that made-up bullshit someone fed me and I never cared to verify it?

[–] [email protected] 4 points 1 year ago

They exist, but the display needs to interface with the tool.

[–] towerful 3 points 1 year ago

Yeh, you get a special camera and some software. Whether the camera looks at the whole screen, or it is something you put directly against it depends on the system.
If you are just doing relative calibration (IE making screens look the same without caring about the actual calibration) I think they can work with just a DSLR.