Much appreciated!
almcl wrote:Individual subs are Canon raw files (.CR2) captured using Astrophotography Tool. Stacked in Deep Sky Stacker with bias and flat frames with all the options unchecked. If you need the data I can put the subs and master calibration files in a Dropbox folder?
I'm thinking it's not so much the data. Looking at the star coloring again, it does appear something introduced some color fringing/color channel mismatch somewhere along the line. You can see it in the single star you have the dropper over as well; the top is bluer than the sides. This is not LRGB data, it's just from a DSLR so I'm not sure here the channel mismatch would come from (with a DSLR all channels are recorded at the same time obviously). Perhaps something in your optical train?
The color signature (orange vs cyan) is a typical blue+green vs rd+green mismatch. This is where the pixels exist for every blue or red pixel, however blue pixels do not exist for red pixel, nor vice versa.
Do you have this issue all the time? Does stacking with a different debayering algorithm (e.g. AHD) help at all?
I think the Undo Background issue arose because I loaded the saved image rather than repeated the previous processing.
Ah, yes that would cause that; there would be no "previous image" in the undo buffer in that case.
