nospam
iphoto is not non-destructive. it makes a copy of an image when you change it and writes the changes to the copy.

Sandman
I.e. exactly like Lightroom. LR has a better UI for enabling and disabling effects, but the process is the same.

nospam
iphoto is nothing at all like lightroom, other than casually in that they manage assets.

Sandman
They are non-destructive in exactly the same way, which is what I was commenting on.

nospam
they aren't.

iphoto makes a second copy of any changes.

it doesn't maintain a database of changes.

if you quit, it's not available.

Sandman
It's because "revert to previous" undo's all the edits you've done in one session.

nospam
with lightroom, you can change anything at any time, regardless of session.

Sandman
It's not as sophisticated as LR or Aperture, of course, but it is 100% non-destructive.

nospam
it's not even close to either.

Sandman
As far as non-destrictivness goes - it's identical.

nospam
no, it's not.