from this thread on TPF: http://www.thephotoforum.com/forum/general-gallery/218243-what-do-you-think.html

On this image, all I did was to set the proper black point for the Green channel, at 16. I then applied Unsharp Masking at 15%, 150 pixel radius, Zero threshold, and assigned a sRGB profile and saved.

The adjustment of the green channel REALLY made a difference in the greens of the grasses in the foreground, and much more clearly-defined the different hues within that large area of greens.