Traditional photo editing is ‘destructive’. That means every adjustment you make permanently changes the pixels in the photo and there’s no way back unless you’ve saved a copy of the original and you’re willing to start again. ‘Non-destructive’ editing is fully reversible. You can go back and undo or redo all of your editing work […]
Saving processed versions of images for use with other programs or devices. Many photo editors use non-destructive editing tools which are just processing instructions within that program until they are applied permanently to a new processed and 'exported' file.