You can open files (photographs):
• From iPhoto.
• While in Photoshop Elements.
In iPhoto, click the thumbnail of the file, hold, and drag it onto the Photoshop Elements icon in the Dock.
With an extra step, you'll be able to compare the original photograph with your edited version of the photograph.
Make a duplicate of the photograph before you edit it.
Then you can compare the original photograph to the edited duplicate.
You'll have before and after versions.
Do the following.
Let's say you want to edit a file called DSC1234.
1) Click the thumbnail of DSC1234.
2) Go to Photos > Duplicate, or press Cmd + d.
You now have a duplicate.
iPhoto appends copy to the name of the file.
Click the thumbnail of the DSC1234 copy, hold, and drag it onto the Photoshop Elements icon in the Dock.
DSC1234 copy will open in Photoshop Elements.
However, it won't be called DSC1234 copy.
It's called DSC1234_2.
With Photoshop Elements 8.0, and later versions, you can easily open photographs that are located in iPhoto.
1) In Photoshop Elements, at the top of your screen, go to File > Open.
2) Go to Media > Photos > iPhoto > Events.
3) Click an Event.
4) Select a thumbnail.
5) Click Open.
If you select an Event and click Open, all the photographs in the Event will open in Photoshop Elements.
For more detail on using iPhoto with JPEG files, click Next below.
If you use raw files, go to Raw Files & iPhoto.