Todays tip will involve using Lab color space in Adobe's Photoshop CS4. We'll make a curves adjustment layer, tweak the a / b channels, adjust the layer opacity, and BAM! Your photo just got more color than a new 64 pack of Crayola's ! Prepress color management and color manipulation done fast.
Step one, open your image and under "Edit" menu, use the Convert to Profile command, and choose Lab.
Step Two go to Layer, New Adjustment Layer, Curves
Next Select the b channel, click on the curve (straight line) and put a point right at 50,50
*Tip for advanced users. If you select the midpoints we anchored (50,50), use the arrow keys to subtley offest the points position. In doing this you can add / remove color casts to images. Use the a channel for red / green, b channel for blue / yellow. DAM! Color Retouching isn't that difficult after all.