Same ICC profile for display and picture = gamma lift?

Question

Here's the thing. I set a synthetic ICC profile as a default for my monitor (it's Rec 709 / sRGB gamut profile with 2.2 gamma stored as a single parametric value) and then i assign the same profile for a picture. As a result Photoshop should not apply any correction because document's color space equals display color space right?

Well, no... It does apply some serious gamma correction. It looks like it discards the profile for image and uses sRGB instead. Why?

The ICC profile i'm talking about can be downloaded here: https://we.tl/t-AxxyjObr72 Here's how it looks like in ICCPorifleInspector:

And here's a capture from my monitor:

D Fosse · Answer

With the same profile as source and destination, you have what is known as a null transform. Nothing happens, nothing is changed. That is the definition of no color management - no numbers are changed; the original RGB values go straight to the display.

So something else is happening here. I'd suspect a video driver glitch. This performed by OpenGL code in the GPU now, unless you disable it in Photoshop preferences (off or basic).

Anyway, if your goal is to disable color management, there's little reason to use Rec.709, which is always a tricky profile to use because the Rec.709 specification is to clip at 16 and 235. Try a profile with more standard behavior (doesn't really matter which).

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