How to batch resizing images in specific wide proportionately?

[peternlewis]

Assuming you select the files first, you can use the techniques shown in:

Working with the Finder Selection

In Keyboard Maestro, you work with the Finder Selection by using the For Each action to iterate over the selected files. From there, you can do whatever you would like with the files using the various file actions, or by processing with a script or other means. There is a smart action in the acton selector for For Each Path in the Finder Selection, which is simply a For Each action, preset to iterate through the Finder Selection collection. You can put whatever actions you like within that ac…

to process each file.

Then Keyboard Maestro can read the image file (Read a File action), resize the image (Resize an Image to Fit action), and then write the file (Write to a File action).

You'll want to ensure you have good backups before attempting any batch operations.