Open the Image Processor programme. Select File> Scripts > Image Processor from the top menu of Photoshop.
Choose a folder.
Changes for RAW Files are optional.
Decide on a file type.
Set the Size Parameters.
Execute the Batch Edit command.
Select Image > Image Size from the menu.
For photos to be used online, measure width and height in pixels; for images to be printed, measure width and height in inches (or centimetres). To maintain proportions, keep the link symbol highlighted.
To adjust the number of pixels in the image, select Resample.
You may now resize all of your photographs in one step. To do so, open Photoshop and select File > Automate > Batch from the File menu. The Batch window should now appear. Select the set in which your action was produced before selecting your action.
Images may need to be resized to fit a specific application purpose. - 1 cm = 28 pixels is the unit of measurement for pixels. - Edit -> Preferences->Units and Rulers can be used to change the units.