[avandonk]

Hagar could I humbly suggest try streching each colour and luminance fits individually in IP with the digital development thingy. The best black and white appearance is a good guide. Then recombine in IP to get a colour tiff. I have found stretching works far better in fits form even with the Canon colour data. I thnk what is happening in the case of the Canon colour data is that information is lost with the interpolation step from fits to tiff. I am sure that subtle colour is lost by stretching in a colour tiff rather than as a fit. The fit images contain all your original data essentially uncorrupted by recombining.

I have been doing this for a few years and the more I do the more I learn and get better. I still have a long way to go.

Hope this helps. Bert

Do the stretching to the luminance first for the best looking B&W image, and then use the same parameters for RGB before recombining.