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Hi Geoff, Having just done a lot of research into flat framing I can say a lot but in most cases the software used to, firstly calibrate the flat images and compile the images into a master flat, taes care of the colour cast in the original images and inevitably converts them to a greyscale image.
Programs such as Nebulosity actually take care of this and run a smothing filter over the final image.
I use a QHY8 and now an Electro Luminecent sheet to create flat frame masters and have found the need to also include Bias frames in the process to get the very best results with this camera. I do all calibration and master flat creation in ImagesPlus and find the process a very simple one.
Like all processing this is all black magic to me but the end result of even ordinary images is greatly enhanced with the use of flats and bias files. Experimentation seems to be the way forward so give it a go and I think you will be pleasantly surprised by the final results.
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