I've been struggling to enhance some very faint lines, like a pencil thin light beam, against what is basically a wide blue sky background. The blue/cyan tinted background and this line are very close to the same shade, and even though you can sit back and tell there's a line or streak there... trying to use Levels, Curves, and brightness/contrast helps a little, but I can't find a way to really make that line or beam stand out indisputably. Fwiw, masking the line and artificially brightening it is not allow. I need this to be sort of 'forensic' proof that what's there is really there. Thanks.