Improving the attached image of M99

[alcol620]

Morning Oddsocks

You mentioned in an earlier post "This is one of the advantages of layers in Photoshop, if you have say a dozen great subs and the same number of slightly poorer ones then make a stack of the best and use this as the luminance layer to reveal the best level of detail, use the poorer subs and best subs together to make a stack for the chrominance layer, boost the colour saturation and then blend the layers giving more weight to the luminence layer, the possible combinations are enough to keep you occupied for weeks when it is too cloudy to get out with the telescope."

Can you point me in the right direction, spelling out how you produce the luminance layer and how you produce the chrominance layer. Apologies for my lack of knowledge.

Grateful for your input

Regards

Alec