For accuracy, I'd say your initial image is more accurate.
M4 is
old, meaning it has an overabundance of older stars yellow/red stars (indeed, it is home to many white dwarfs), given that any bright blue giants would have long expired. So, a yellower appearance of the cluster is to be expected.
As is the case with many OSCs., your
ASI-071 shows an increased green response in the higher wavelength, which tends to make things more yellow. This is hard/impossible to balance out. The solution is to use a luminance filter (aka IR/UV filter) that cuts this response before it increases again.
I can't quite tell whether you used such a filter here, as the yellowing does not appear to be too bad compared to some other instruments having the same quirk/feature. However, the foreground (random) star field should exhibit a good random distribution of star colors, but is IMHO comparatively lacking in blue stars a little with an over-abundance of orange stars, providing some anecdotal (not conclusive) evidence that there a slight yellow bias. At the end of the day, just increasing the blue bias from the default color balance goes a long way I think, arriving at something in between the two images you posted.
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- Autosave001(3).jpg (494.89 KiB) Viewed 6472 times
Hope this helps at all!
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