How to batch rename images, in reverse numerical order? My camera names its images IMG_0001.jpg, IMG_0002.jpg, IMG_0003.jpg, etc.

I have about a thousand images and would like to rename them without having to do it manually if possible. 

Is there a good way to automate the process of renaming them in the reverse order - e.g. IMG_0003.jpg, IMG_0002.jpg, IMG_0001.jpg?
You can use an Automator Workflow. 

Something like this:



Sort Finder Items step will sort image names descending (IMG_0003.jpg, IMG_002.jpg, IMG_001.jpg). 

Make Sequential step will rename them sequentially (IMG_0001.jpg, IMG_0002.jpg, ...).

Copy Finder Items step is optional, just to be sure not to mess with original files.