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Ivo,
Much appreciate what you are saying here. I'm using a mono CCD with the LP filter only for luminance. However, I find my LP is in quite a gradient and certainly not smooth over the whole image. How would you process the RGB stacked frames to eliminate the gradient? I've taken note of the requirement to do this before stretching (but without stretching I find it somewhat difficult to see the gradient). My usual tools are CCDStack and CS-5. I've had some success using the flatten background tool in CCDStack before creating the RGB combine in CCDStack. However, I don't always have success with that tool. Thanks for any assistance!
Peter
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