help-- i've gone online and just can't figure this out. i have two layers in photoshop-- one is my primary image layer. the second layer is a grungy texture. i want to use the grungy texture layer as a mask for the primary image layer... so the primary image "disappears" where the darkness of the grunge is... hopefully giving my primary image a weathered, grungy look.
this should be easy to do but i can't figure it out for the life of me!
Take the layer that you want to use for mask, select all and copy (Command C), Go to the channels palette and create a new channel, paste the layer you just copied (Command V)
This creates a grayscale version of the layer. Hold down the command key and click on the channel in the channel palette. This will make a select from the white areas; will also create a select based on the level of grey in the image.
Go back to the layer palette, click on the layer with the image you want masked, and click the mask button at the bottom of the palette. This will mask your image.
Things you can try to alter the mask are.
1. Invert the mask (Command I)
2. Use the curves tool to increase/decrease contrast, levels of white or black