Frodge wrote in post #15923714
When you say ps is destructive what do you mean? I'm learning a lo from this thread! Is light room totally non destructive?
Think of PS being mostly a pixel editor. LR edits are sets of metadata, such that you have the original pixel data + a set of recorded edits. That's an oversimplification (as PS can do some non-destructive edits) but it means you can have multiple copies of a file with edits in LR (e.g. a copy that's been edited to keep colours in gamut for a print) and the extra data that's stored is much smaller than a whole copy of the image.
You can, as already mentioned, also then copy a set of edits to another image; so for instance, if you had a horizontal panorama of several shots you could do a set of edits for colour temperature, clarity, brightness, saturation, and even grad filter effects on the sky and cropping, then copy those edits to all the images in the sequence with just a few clicks.