I think I know what you are trying to accomplish. It sounds like you have multiple pictures (one on each layer, I assume) and you want to feather the edges of each one. Unfortunately, there is no quick method for this that I know of.
It seems like you could use one of the effects, but I tried playing around with the inner stroke effect with a gradient following the shape. The gradient’s opacity could be changed, but you always need a color. It would be an interesting stroke effect that just modified the opacity level.
Next best solution I know of is to create an action. For this technique, make sure each layer has the picture on a transparent background. You can’t have a colored background since that color may be in the picture. Also, you will need an area that is transparent across all of your layers. Your action would be:
– Magic wand tool (have ‘contiguous’ and ‘sample all layers’ unchecked) and click in that common transparent area. This should select all of the transparent areas for that layer.
– Invert selection. This should now just have your picture selected.
– Select->Modify->Contract (choose a number of pixels that work for you)
– Select->Modify->Feather (use the same value for the pixels that you used above)
– Add Layer Mask
Run this action on each layer.
Pauley