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Any idea why I'm getting this square box around the star? It made the diffraction spikes fine, but the box shouldn't be there. I made a mask that just covers the bright center of the star.

I have this image of Cygnus, and as you can see, there is a dark arc-shaped section on the right side. It's actually on the left side, too, but I cropped it out. What causes this,and how can I get rid of it?

Ah, thanks

Also, I think part of the cloudiness I was seeing was actually part of the Milky way (not the crazy edges of the frame, but the more central areas).

OK, thanks, I will give it a shot!

I re-stacked with flats this time, and now I get this when I wipe....

Have you used calibration frames ,darks flats bias ? ,did you crop borders of image to rid edges of image of stacking artefacts ,helpful if you post imaging setup details too ,equipment used stacking program etc. I'm very new to AP, so I haven't done all the other frames for now, just light frames....

Thanks! I will try re-stretching; that's something I didn't do afterwards. Also, I didn't use flats, so that could be part of the problem. I'll play around with it some more and see what happens :thumbsup: P.S. I posted the shots backwards.....the first one is after wipe, and the second is the origi...

So I'm not sure what is going on with wipe, but it seems to make matters much worse. Any tips on what I may be doing wrong? This image is just a wide shot of Cassiopeia. As you can see, the pre-wipe version has vignetting, but it's nothing too bad. I run wipe, and I get the second image. Do I need t...

I guess I am missing something, but why can't I save the image when done? If I rename the file, I get this error (attached). If I overwrite the original file, it works, but I shouldn't have to do that, right?