Alastair M. Robinson wrote:
> In short, though, if we use this method, we don't need to agree on what
> to call our working space, because it will simply be whatever is
> appropriate for the image being edited! 

Dave Neary wrote:
> I think this is probably a very bad idea. 

I agree with Dave on this one.  Here is just one example of the sort
of nasty thing that can happen if different images use different color
spaces, with corresponding display filters:  You could have two 
two-layer images, A and B, such that:

(1) Layer A1 is visually identical to layer B1.
(2) Layer A2 is visually identical to layer B2.
(3) When layers 1 and 2 are composited in "Add" mode, the two images
look different.

This can happen because of the nonlinearity in color profiles.

It would be a real can of worms not to use the same color space
internally for all images -- losses in conversion are not an important
enough factor to overcome this.  (But there is a reasonably strong case
for allowing choice as to which color space is used internally.)

  -- Bill


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