What about a mass petition to Sigma

Started Sep 9, 2008 | Discussions thread
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Roland Karlsson
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Re: What about a mass petition to Sigma---GO FOR IT!
In reply to Roland Karlsson, Sep 14, 2008

Roland Karlsson wrote:

Truman Prevatt wrote:

I think what has been shown is it is not unitary. If it were not
invertible the image in the (r,g,b) color space would only be two
dimensional and balanced (r,g,b) images would not be possible which
we know is not true.

There are a number of problems to find the inverse - some theoretical and some practical.

Some are related to the possibility that there might not exist any inverse, i.e. several values in the X3 space might correspond to the same value in RGB space.

Some are related to that SPP needs to do noise reduction. No matter how this noise reduction is made - it is very hard to find the inverse of noise reduced data.

Some are related to that we dont know what SPP does.

And some are related to that we dont know what settings was used when doing the conversion. Even fill light might have been used and an unknown color correction.

And - I am sorry - but I lost the reason why it would be interesting to convert from RGB to X3 space. What was supposed to be gained by that?

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