it is done through adjustment layers.
if you google this and select video you can watch tutorial on how to do this.
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Some of the tools I use currently:
Canon 40D - Canon Speedlite 430 EXII- Canon EF Lens - 50 mm - F/1.8 - Canon EF 28-135mm f/3.5-5.6 IS USM - TAMRON 11-18mm F/4.5-5.6 - Tamron 70-200mm 1:2.8 Di LD (IF) Macro - Gary Fong lightsphere - Dual 24 inch monitors - Dell Quadcore 2.8 8gigs ram - Photoshop CS4
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