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It's easy, well, when you've done it a few times.
Here's how to do it (and other batch processes) in Photoshop:
Window .. Actions
(Optional: drag the window to the tabbed area along with Channels, History. Layers, etc.)
Activate drop-down list from triangle in 'Actions' tab. Select 'New action' and call it 'Invert'.
Hit 'Record'.
File .. Open (find one of your files).
When your selected file is open: Image .. Adjustments ... Invert
Save as ... any name .. to desktop (it's just a temporary 'Photoshop training file' to be discarded later)
File ... Close.
Actions tab (triangle): Stop recording.
Photoshop has now been 'trained' to Open, Invert, Save and Close a file.
Now to batch process:
Create a new folder to receive the batched files.
File ... Automate ... Batch...
(Play) Set: ('Invert" action should already be selected. If not, find it in drop-down list)
Source: Folder (find the folder containing your original files)
Tick all four boxes below (to prevent Photoshop asking where to save for each file, etc.)
Destination: Folder (find the new receiving folder you created)
Tick 'Override' box.
Hit 'OK'.
Sit back and watch hundreds of files being converted automagically.
(Don't forget to discard the 'training file' on your desktop.)
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