Edit an image in Keynote on iPad
After you add a photo or graphic to your presentation, you can crop it and remove parts you don’t want.
Mask (crop) a photo
You can hide unwanted portions of an image without modifying the image file.
Double-tap the image.
The mask controls appear. The default mask is the same size as your image.
Use the controls to frame just the parts of the image you want to be visible.
Tap Done when you’re finished.
Double-tap the image at any time to readjust its mask.
Remove background and other elements from a photo
Use the Instant Alpha tool to make parts of an image transparent. This feature is useful for removing an unwanted background or color from an image.
Tap the image to select it, then tap .
Tap Image, then tap Instant Alpha.
Drag your finger over the color you want to disappear.
As you drag, the selection grows to include areas that use similar colors. Tap and drag multiple times to remove multiple colors.
Tap Done, or tap Reset to undo all your changes and restore the image to its original state.
To work with multiple images at the same time, touch and hold one image, then tap the other images with another finger.