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Pope1402555

: Embedded display profiles vs absolute colorspace profiles inside pictures I'm trying to understand color management, and have stumbled across an issue: I've seen many people, and some tools (like

@Pope1402555

Posted in: #Color #ColorProfile #Osx

I'm trying to understand color management, and have stumbled across an issue:

I've seen many people, and some tools (like the OSX system screen shot utility) that will embed the icc profile of the monitor inside the picture file.
My understanding is that the embedded profile should be the icc profile of an absolute colorspace such as sRGB/adobeRGB etc, not that of the particular monitor it was displayed on.

What am I missing here? Help me find the fallacy in my reasoning:

When you design an image on your computer with a profiled display you get to see the colors in your monitor's native colorspace, but the RGB color values are stored in some other (reference) colorspace. When you save the image, you save along the information of what this reference colorspace is, so when the next person opens it, his computer will transform this reference colorspace into his own display's native colorspace and reproduce the actual color.

Why would anybody embed the color profile of his display? How would this help? Even if one did, that would require to define it against a reference colorspace; then why do it in the first place?

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@Gail6891361

All color spaces are alike, theres is nothing special about the standard RGB color spaces as opposed to the device colorspaces. They are exactly the same, they both describe conversion form that space into an absolute color space (Neither sRGB or Adobe RGB are absolute spaces). You can then convert back form that absolute color space to any RGB space. Normal caveats apply. You would do this for a scanner, but you could do the same for a monitor.

Why standard spaces? Theoretically it gives you a target to calibrate against. So that you can make 2 monitors display the same even without color transformations (this is how web is supposed to work). It would also be possible to factory calibrate things. In practice this does not work, except perhaps for sensors, monitors not so much.

On the other hand if you are going to color transform you might as well utilize the entire size of your monitors space. Then you would just rely on profiling your device and convert to that space. Its a perfectly valid strategy, theres no need to calibrate as long as you have a profile. Un-profiled stuff is now wrong but theres no way to know what they were supposed to be anyway. And whaen you monitor travels in its color reproduction capability due to age and use you get different results but yes still valid (same would apply to standard spaces unless your monitor is significantly larger in size and can crop off some parts).

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