- Open Photoshop and go to the Actions palette > Load Actions > Load the attached “Image Processing.atn”
- Go to File > Scripts > Image Processor and set all your settings as you normally would. In the Preferences section select Run Action > Image Processing (first drop down) > Fit Image 25000px (second drop down – this is the .atn action you loaded)
- Run
Action (zip): Image Processing.atn