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Do not set your monitor profile as working RGB. Ever.
Do not set color management policies to "off". Ever.
Neither fixes anything, but conceals the real problem by disabling display color management altogether. Set everything under color settings back to defaults.
The problem here is a faulty display profile, not the document profile or any policies for handling document profiles. Those two are very different things. You probably got this bad display profile through Windows Update. Samsung is notorious for this. Their profiles should be avoided like the plague.
The real fix is to make a new profile with a calibrator, but if you don't have one, use sRGB IEC61966-2.1 for now. If your monitor is a wide gamut model, use Adobe RGB.
Relaunch the application when done, it needs to load the new profile at startup.
Worked ! Thank you very much.
I might have messed up the colour management policies in photoshop a bit, see my picture above... Could you hint at what I should change from this ?
Thank you again.
The main thing is that you have color management policies set to "preserve embedded profiles". This is important, any other setting really requires that you know what you're doing and are aware of the consequences. Not that I can think of many scenarios where they might be useful.
With "preserve embedded", the document's color profile will always be correctly treated.
As for working space, it's really just a fallback default for new files. With the above setting, incoming profiles will always override it. The problem is that if you set it to Monitor RGB, it will automatically change policies to "off", because that's the only way it makes sense to use it. So the incoming profile won't override it as it should (in fact it will be discarded altogether).
Set working RGB to sRGB IEC61966-2.1 until you have more experience. There are good reasons for using larger color spaces like Adobe RGB, but again - that carries implications that you need to be aware of and take into consideration. sRGB is always safe.