Cant save/find altered pictures on iPhoto

Could someone please help. I try to alter, crop, enahnce etc digital photos on iPhoto but they never seem to be saved anywhere.

I open the photo, alter it and then press DONE to save - is this correct? I can't seem to find a SAVE button. DoI have to export to save it. Nothing seems to save my altered pictures. I know I am doing something very basic that is wrong....

What is the process to actually save changes you made to pics? And where are those saved pics located?

Cheers
Ibu Liz

Sorry, never use iPhoto but will give you a bump back up to the top.

If I remember correctly... the default in iPhoto is to change the ORIGINAL... After you have made the changes, and click done... it will pop-up a "saving Changes" window.... Go into the iPhoto Library and open the photo again... the changes you made should show.

Yeah, iPhoto saves changes when you hit done.

But it ALWAYS works non-destructively:
It actually saves a copy of the original image and also of the altered picture. Right-click an image and select 'revert to original' if you want your original back.