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Originally Posted by atalas
Very good save Tony ! I can see the DDP effect around one a star I think correct me If I'm wrong
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I think you might be noticing a side effect of the star size reduction routine, rather than the DDP.
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Tony ,You've done a hell of a job trying to correct for servere gradients ! I wish I had those exposures from a dark site wth no moon.
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A dark site will do wonders for your images, and I don't even bother with a moon around. Might as well go
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Those DUST MOTE ! your right there mate ,I have to clean the chip I'm sure It's coming from there. They shoot up as soon as you start streching the white point in levels . If I wasn't so lazy Tony I would learn to take and subtract FLATS ! eh , I think I would rather just clean the optical path, one of these days.
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Flats are
really worth the effort. A good master flat applied during calibration will correct a whole range of problems and make the stretching SO much easier to deal with. My advice: Do It!
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Thanks for your work on this image and sharing of knowledge Tony and everyone else who had a go much appreciated.
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No worries, it was fun. I must be a little weird though. I enjoy the processing probably more than the aquisition. If someone feed me high quality data I could keep myself amused for weeks.
Although I must admit there is a peculiar satisfaction in doing the whole thing yourself too.
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In the first images I sent you Tony one of those green looking exposures were averaged with the others so I wonder If that was the problem in the green channel ?
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Almost certainly. The colour balance was really screwed up.
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It looked like the one I posted in this thread but was a 10 minute exposure .
This happend after I had saved as fits file and then when I reoppend the file to align and sum them one of them was green like the image above .
Now It happend again to another exposure I took last night a 15 minute sub which is the one I posted in this thread , any ideas whats happening here Tony ?
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Sorry Louie, someone else may be able to help. I'm clueless on that one.
Cheers