Photoshop transparency

[saltface]

I'll bet there's a tutorial on this somewhere on the web, but I can't find it.

I'm trying to stack several images together. In order to see underlying layers, I need to remove varying shades of black from each layer.
Rather than using the magic wand tool, I'd like to turn black to tranparent varying on intensity ( 100% K = 0% opacity, 50% K = 50% opacity, etc...).

Ideas? Suggestions? Dirty jokes?

 

[reg]

What?

 

[Garbz]

If I understand this correctly you can simply put the layers on top of each other in photoshop, right click and click blending modes, and then adjust the "blend if" sliders. To select which lightness tones you want the above layer to have visible.

Btw for anyone else reading this is a very powerful tool when adding glow effects and overlays

 

[saltface]

This definitely is what I was looking for. I'm going to have to play with it a little to be able to use it. Thanks.