Quote:
Originally Posted by multiweb
If you look at the very bright stars and the cluster at 10 o'clock you'll notice the stellar profiles are gone. This is because when you balance the dynamic range to blend the panels, the one with antares and the yellow neb is very different from the one with the cluster. Once you blend them in, one has to give. In this case the cluster got black clipped. There are two things you can do to avoid this. Do a pixel maths prior to join them or save scaled data and cheat a little in the stretching. The final histogram in PS doesn't reflect individual panels clipping. Once you join them the histogram will show the whole picture
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Actually that has been brought about by my doing. The base data has some high cloud issues and as a result the whole of M4 has a very definite magenta cast to it. You can see the blue stragglers and the orange giants but the white stars are the ones with the magenta. This is why I want to collect another couple of frames. It has upset the balance right from the start. I will have to deal with it better once I do the next two panels down. I don't doubt that one has to give way over the other. Doing a mosaic in this area is not going to be easy and I am sure in the end it will be a compromise as it is now.