Changing color space

[digitaldog]

Clearly Mr Rockwell and Mr Fong are troubled by neither self-doubt nor intellectual curiosity.

The proof of Mr Fong's troubles are evidenced here on LuLa by the man himself (it's quite a funny read):
http://forum.luminous-landscape.com/index.php?topic=92767.msg755252#msg755252
He threaten  to sue me for slander over all this, then quietly left without further word. They guy appears to be manic.

[BobShaw]

I am not really understanding the question.
Is it that you are concerned about the numbers changing or the colour changing?

Why would you expect them not to change in either case?
In the first case corresponding numbers for each colour are different in each colour space.
In the second case you are going from a big colour space to a small one and the colours outside that space are clipped off. Depending on the rendering intent either only those colours are clipped or all colours are shrunk down to fit in the smaller space. Either way the colour changes. I visit a lot of camera clubs and you see print competitions where many of the prints have a magenta tinge.

Unless you are a portrait photographer (where all tones do fit in sRGB), don't use sRGB. Even then, why do it. To me it only has a purpose on the web where colours are seldom as they are anyway.

If you disagree, no need to tell me, please continue to use SRGB.

[bjanes]

I am not really understanding the question.
Is it that you are concerned about the numbers changing or the colour changing?

Bob,

What question? The OP's question was concerning why HDR toning of an image in ProPhotoRGB was returning an image in sRGB with potential clipping of out of gamut colors. That problem was solved and the thread went off topic into the choice of a working color space: sRGB vs ProPhotoRGB. That topic was debated ad nauseum in a prior thread and this thread should be done.

Regards,

Bill

[digitaldog]

Bob,

What question? The OP's question was concerning why HDR toning of an image in ProPhotoRGB was returning an image in sRGB with potential clipping of out of gamut colors.

I thought it was about a 'color shift' of which I've not seen doing such conversions. But either way, the OP seems to have sorted this all out.

Since upgrading to 2015, I've noticed that I occasionally get a automatic, unintended color shift from ProPhoto to sRGB.