iPhoto for iOS (iPhone): Edit a photo
Use the editing tools to improve or add an effect to a photo. As you edit a photo, iPhoto saves your edits automatically (there is no Save button). iPhoto never changes the original photo, so you can go back to it at any time.
Make edits to a photo
Select a photo and tap .
Tap an editing tool (shown above) and make changes to your photo.
Edited photos have a toolbox icon on them.
To switch between viewing the original photo and the edited version, tap .
If you edit a photo in the iPhoto Camera Roll album, the edited photo automatically appears the Camera Roll on your iOS device, at the resolution of your device. If you want a full-resolution version of the edited photo sent to the Camera Roll, tap and tap Camera Roll. The full-resolution photo appears in the Camera Roll, and is transferred to your computer when you sync the Camera Roll with your computer.
You can also send photos directly from iPhoto to other iPhoto-supported apps installed on your device.
Undo and redo edits, or revert to the original photo
To undo your last actions, do one of the following:
Shake your iPhone or iPod touch and tap Undo.
Depending on the editing tool you are using, tap , then tap Reset, Remove, or Erase All.
To revert to the original photo, tap a photo to select it, then tap > Revert.
To revert to the original photo while using an editing tool, tap , tap to exit the editing tool, then tap > Revert.
Copy a single change in color, exposure, or an effect to another photo
If you've made a change to a photo's color, exposure, or effects, you can copy the change to another photo.
While editing with the exposure, color, or effect tool, tap , and tap Copy Tool Name.
Tap to select another photo, then tap the tool whose settings you copied.
Tap > Paste Tool Name.
Copy multiple settings to another photo
If you've made edits to a photo's color, exposure, or effects, you can copy all three changes to another photo at once.
Select the photo whose settings you want to copy.
Tap , and tap Copy Exposure, Color and Effect.
If you’re editing the selected photo, tap and then tap to exit the editing tool.
Select the photo you want to apply the settings to and tap > Paste Exposure, Color and Effect.