I wanted t keep this tip so I put it here...................
When you open an image for the first time, change the mode immediately to LAB. This "gamut" is a range that is defined by three channels, two devoted to color and one to tone. The "L" stands for "Lightness". Once in LAB mode, apply the CURVE command, and play with the two extremes of the curve, especially the highlight end.
What happens is a shift in grey without affecting the actual colors. The LAB gammut (a gammut is a range, in this case a range of grey values) is larger than both the CMYK and RGB gammuts, giving more flexibility to change colors and tones.
By changing the Lightness curve one can remove grey casts while improving contrast and allowing color to come out more vibrantly. When turns back to RGB or CMYK one will find the changes have been non-destructive to the histograms, leaving one with the full range of gray values.
You'll see how it cleans up many areas, making it much more pleasant, while other areas are harmed.
To localize the effect, simply click on the "Create new fill or adjustment" icon on the layer palette, choose curves, apply the desired curve, then airbrush onto the layer to eliminate where you don't want it applied.
It's quick, it's easy, and you'll be amazed at the non-destructive improvement in quality.
Thank you Don
and the bugs keep marching on...