How do I edit multiple layers in Photoshop at once? Highlighting them all or selecting them selectively while holding shift does not work (for example, when applying Layer Options effects to layers).
Adjustment layers can be useful here for the edits found in
Image > Adjustments. More on these can be found here.
For layer styles, do what you want to one layer. Once done, right click on that layer and click
Copy Layer Style. Select all the other layers you want to apply it to then right click on one of them, then click
Paste Layer Style.
Hope that helps.
One method is to convert the layers into smart objects first.
First, select the layers you want to edit in the layers pane
ctrl+click then right click and choose
convert to smart object.
(It might be a good idea to duplicate the layers first)
Once that is complete, right click the smart object and click
This is basically another PSD file within the layer, you must commit the changes before it will take any effect within the normal PSD though. :)
I typically duplicate the layers I want to edit together and then merge them. (Keeping a copy of the original layers). This is a nice quick way when you're editing photos.
However, if I'm keeping the layers separate, I would recommend using the Adjustment Layers as Scott suggested. Though, this will effect all layers underneath the Adjustment Layer - though you could use some creative masking to ignore other layers (as long as the don't overlap on top).