Stupid question that I probably know the answer to but here goes....
Is there a way of telling the difference between RGB images from a monochrome camera other than file name?
I only just recently got some RGB filters and I've made a right dogs breakfast of keeping track of what colour each set is. Lesson learned though, won't make the same mistake twice.
I'm guessing the answer is no? Or the answer is yes but only for two channels as the weights are different?
Another approach would be to find a colour image online of the object you've imaged, separate it out into the R, G, and B components, and then compare each of your subs (with a quick screen stretch) to the reference images.
1. What image capture software did you use? It may have written the filter names into the FITS files? Or...
2. If the exposure lengths are similar you could get close by just combining each combo in the 3 channels to see which one looks right. 123, 132, 213, 231, 312, 321. Wouldn't take that long.