One of my favorite ways to jazz up colors is to use Lab mode. Convert your image to Lab (this is lossless btw) and then go in to curves. Change the grid in the curves histogram to 10’s, you do that by Alt clicking in the grid box.
Load my curves setting file, which you can download from
http://www.sonic.net/keesha/lab_color.acv You can then see what it does. It really makes the colors pop and it does so in a way that is very hard if not impossible to duplicate outside of Lab mode. After you apply it you can use the Edit > Fade command (must be done right after using Curves) and fade it back if it is too much. Then covert your image back to RGB.
I got this technique out of the Lab Color Space book from PeachPit Press. I didn’t much like the book in question, but I did get some useful tricks out of it at least. Myself I created an action that does the coversion to lab, apply the curves with the file above, fades (brings up the fade dialog box so you can set it the way you want) and then coverts back to RGB, so it is basically a simple process.
This works best on organic items like rocks, trees, wood, things like that. It tends to bring out some really nice subtitle color variances.
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