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Not sure what you mean by RGB aligned as this is a colour DSLR so the output is already colour. Do you split the image into colours and process separately? (Some DSLR imagers do that).
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What I did is adjust the RGB levels until each was exactly the same, this is why its now white.
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The dust is removing nicely but there still seems some vignetting present, at least in the small thumbnails.
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Yes I wondered about that, are flats supposed to remove it as well?
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Also you need to clean your camera - that's pretty dusty and cleaning your gear regularly is a lot easier than flats!
My current procedure for flats is to take several and then max/min clip combine in CCDstack then when I apply them to the image I select the bias subtract option.
There is a paper by Richard Crisp on flats. He is a semi conductor engineer and an expert in this field. Apart from the complex maths etc (best to skip over that unless you are into maths) it is quite informative.
He basically states that with CCDs (it should be similar for DSLRs) that they are very linear (meaning they respond in a predictable straight line type way at different light levels). He recommends taking a quite bright flat and a flat dark subtract (a dark of the same duration and temp as the flat) to give the minimum amount of noise the flat introduces into the image.
Flats can be a tricky area of processing so its worth a thread by itself as there are bound to be different approaches from various imagers here.
Greg.
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Good to know, thanks
Jo