If I have a render on a layer how can I apply a gradient map to it that will only affect that render and not the background on the previous layer aswell.

double click on layer.
layer options bar should show up.
click on "gradient overlay"
then adjust gradient to what you want.

Thank you! Can I also ask how do I do this with adjustment layers?

This post was edited by MysticHeroes on Apr 13 2011 01:44pm

not sure atm

This post was edited by cletus7seven on Apr 14 2011 07:38am

Go to the adjustment layers tab, click gradient maps, choose your gradient and work out your blending options with different opacity etc.
Once you have done that, press ctrl + alt + G (make sure the layer with the render is below the layer with the gradient map)

This post was edited by AWER on Apr 14 2011 07:35am

^ yes. called clipping masks. only affects whatever is under it

Thank you ever so much