Just about anything you want to do to edit color and luminosity in your images, can be done with the curves adjustments. It’s a super powerful tool, but like all tools, takes a bit of practice to get the hang of. Within Adobe Photoshop, there are a few extra little features built into curves that let you easily color match elements within a composite.
This is an in-depth video demonstration of working with the Curves tools in Photoshop.
Take a look and let me know what you think – have you used curves in your work before?
Photographer's Lair 
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