John,
Were you taking multiple darks and then median combining them? I find that if I take 15-19 dark frames and median combine them, I don't have amp glow issues, and that's with 10-minute sub-exposures, using a Canon EOS-350D.
I'm not entirely sure if the flats, flat darks or offsets are responsible. I guess you could use the healing tool in Photoshop to clone them out. It's a great tool. There's also a hot pixel remover plug-in which I saw somewhere. You might have to Google for it.
Regards,
Humayun
Quote:
|
Originally Posted by JohnH
Yes -I used to use manual darks exclusively - but then I ran in to issues with amp glow on the longer exposures - in camera NR seems to be much better at removing that. I am unsure as to the source for the hot pixels - they leave little trails on the stack - could be they came from the bias or flat frames rather than the lights. I will have to check. I thought they should be easy to remove as they are a single colour - but I cannot find an easy way to remove them...
Is anyone else imaging with a UHC type filter in line? Am I mad doing this ? Should I use a LPR rather than UHC to ensure more realistic colours?
|