There is often confusion about what digital literacy is. I found this link on Teach Thought (great site) very clear. Clink on the link for further information.
The great news is that the alpha tool feature on the Keynote and Pages apps has been added. This is the great feature that allows users to take out the background of images. I used this in my classroom to create all sorts of fantastic images for our inquiry as the students can layer their own photo over other images. Read about it here