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PS color space conversion function is reliable?
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ckholy

Joined: 06 Nov 2011
Posts: 1



PostPosted: Mon Nov 07, 2011 12:25 am    Post subject: PS color space conversion function is reliable? Reply with quote

I have a problem which driving me nuts for a long time.

I'm using CS5 with my monitor calibrated by Spyder2Pro and the device ICC correctly defined in Windows7 color management.

I expected if I convert your picture to another color space the result is just the same as you preview it by soft-proofing with preserve RGB unchecked.
This is also what proofing is designed for, right?

e.g.
My display system is AppleRGB compliant, I have a AdobeRGB picture, I want to convert it to sRGB color space with preserve RGB unchecked such that in the target color space system can see my preferred color whatever they are using color management or not.
Before doing the conversion, I shall preview it by using soft-proofing with preserve RGB unchecked. I will find there is slight color change due to the target gamut is narrow and this is expected.
After conversion, I use the soft-proofing function again to view the "converted sRGB picture" in the target sRGB color space to make sure nothing wrong and the result is positive as you can expect.

However, the above seems 100% correct workflow doesn't work if you target gamut is wider than your source!!!!

e.g.
An sRGB picture soft-proofing to AdobeRGB with preserve RGB unchecked, the result has no color shift as the target is wider in gamut.
So, if you convert the sRGB to AdobeRGB profile and then use soft-proofing function to view the "converted AdobeRGB picture" in the target AdobeRGB color space, the color shift!!!!! It is different from my previous proofing result???

Is that PS color conversion is incorrect????

You can do the same test as me by yourself, no need to have monitor calibration all as this is actually a comparison btw PS's "Color space conversion" and its own "soft-proofing" functions

Hope that any expect can share your experience among this issue.

***********
Someone just told me, this problem is due to double profiling.
The same color profile of both input & output can't be using in proofing function and it's also unnecessary.
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