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Thanks for responding! Hi, We could maybe have a look at the data if you could share it? I don't have a good way to share stuff, unfortunately. The DSS TIFF is 148 MB.(I don't suppose I can upload it here?) These are not typical gradients in that they undulate very fast in distinctly different color...

"if there any artefacts (not just stacking ones) left in when you wipe"

What other kinds should I watch out for? I'm pretty sure the cropping (which, yes, I do before wiping) would've gotten rid of all the stacking artifacts.

Yep, thank you for correcting my mistake, I meant flats. And yes, I know how useful they are, but they just aren't practical for me so far. Native camera resolution is 4080x3040; I've been binning it at 71%, then cropping out the stacking artifacts, and then cropping again later on. The full-res ima...

I took a night worth of shots of M8 and M20 a couple weeks ago. After a lot of processing in StarTools and elsewhere, I still have some pretty nasty gradients across the image. There are reddish bars toward top and bottom, then wider bluish bars, then an area that seems not to have any gradients tow...