Graeme Gill wrote:
[...] I was more thinking that you'd select certain colors of the image, and then define what output color they are to have in a preview. There would be some sort of "region of influence" control to determine how local (in color space) that is. There might be some parallel 3D view of the gamut mapping in terms of mapping vectors, gamut surfaces etc., so that you can see how such changes relate. [...] The approach as described seems to be a rather technical interface though. I was thinking of something a bit more direct.
You are right -- it's interesting to see the "live" connection between the colorspace and the image, but the editing user interface is not really user-friendly. Selecting colors by clicking on them in the image is certainly the most intuitive way. And developing a user interface to define regions of influence and manipulate colors in 3 dimensions is a challenging task. I'm excited :-)