A single split toning adjustment has been applied to my entire collection (no idea how I've done it). How can I undo it and revert to individual split toning settings I had on each of the hundreds of pictures I had in that collection? UNDO option works only for the last action. HELP!!
Try- (perhaps one folder first to test)
1. Develop one image
2. Set Split Toning Saturation settings to zero
3. Create a preset- ticking ONLY the "Split Toning" and "Process Version" boxes.
4. Apply this Preset to all the files that were split toned.
Step 4. could be done (in v6) in the Library Grid by selecting all your images and choosing the new "Reset Split" preset from the 'Quick Develop' panel drop-down menu.