New answers tagged actions
In photoshop go to File->Automate->Batch and you can select the action to use and the file naming of the output files
If by macro you mean action, you should be able to go to the Actions panel, find the spot in your action which says "image size," and double-click it. The red Record button will come on. Put in 40%.
I don't think it is possible to script a prompt for a selection since the action recorded uses precise dimensions. If you record a selection of 400 x 600, that is what it will use each time. But what you CAN do is Create 2 separate actions for before and after your selection. Assign a shortcut key (Function like F1) to those actions. Now, hit the ...
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