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Hi David,
One thing I just noticed is that the image has an ICC Profile of "Display". You probably want to modify your PI colour management setup (under the Edit menu) and set your default RGB profile to one of the device independent colour spaces. I use ProPhotoRGB but AdobeRGB would be a good choice too. The second thing to do is to convert final content for the web to sRGB so it will display at least halfway OK on non colour managed browsers and crappy screens. You can use ICCProfileTransformation in PI or Edit>Convert to Profile in PS.
Pixel peeping at the full res image the thing I noticed in the blue is from halos around some of the blue straggler stars. A couple have purple halos too. At lower res it looked a bit like a blue cast around the outer concentration of the glob.
Cheers,
Rick.
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