But I still don't get it.
Let's say I've got an HDR photo. Not a faux-HDR photo,
where the final image is already in sRGB... no, I'm talking like, a genuine 10-bit HDR image.
(Now, first of all, I don't even know if this is possible, on the web. Are there photos like this? All the "HDR" photos I can find are always already converted to sRGB.)
Or perhaps, the only way to see a "genuine" HDR photo, is to go to Netflix on a computer with an HDR screen, and load up something like Marvel's Daredevil, making sure you are watching the HDR version, and pause the video during a bright scene...
If you had Photoshop open, and you used the eyedropper tool to sample the color of that video... would it give you the answer in 10-bit or 8-bit? Would the eyedropper tool "know" that the image is HDR? Or would it treat it as sRGB? If it treats it as sRGB, does that mean it's using perceptual or relative colorimetric rendering intent, to do so??
I can't do this test myself, since we do not yet have HDR monitors at our office...
Oh, and this is important:
I thought that all devices would already have information about all the major color spaces already loaded onto themselves. So, all the most common color spaces within the categories of CIE, RGB, YUV, HSL/HSV, and CMYK. That way, the only metadata a photo would need would be: "This photo is adobeRGB. Display it in the best way you can," and the device would take care of the conversion into its own native color space, on its own.
But, I guess that's NOT how it works? Like, every device perhaps ONLY knows how to convert from a PCS (Profile connection space) like CIELAB into its own native color space? So, an ICC profile needs to have detailed instructions for how to convert the values of a picture's pixels, (which might be AdobeRGB) into a PCS (Let's say CIELAB), and only then will the device be able to convert from CIELAB, into sRGB, doing so according to information already contained on the device?
Because THAT would make sense. Please tell me I'm right...
Or, does the ICC profile ALSO contain information on how to convert from CIELAB, to sRGB? Because that seems crazy. It'd have to have info about how to convert to EVERY possible color space, because it doesn't know which one a device might be using. Surely it might only specify "please use relative colorimetric rendering intent, NOT perceptual." and that's all... riiiiight?