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Here's is an image of the levels histogram of your image on the left. See how at both ends the black graph looks like its been chopped off. A more even curve may give a better result. Like the other example on the right, though if you look closely you will see that I've clipped that one just a bit on each end.
btw the second hist is of one of my images, not an adjustment of yours. Once your histo is clipped the clipped off information is lost and can't be reclaimed (unless you know how to use the PS history pallete)
Also something I didn't mention in my previous post, when saving your initial DSI image see if it is possible to save it as a 16 bit image (TIF, FITS or BMP not jpeg) rather than an 8 bit image. You will have more information to play with that way. I can't remember if you can save DSI images as 16 bit
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