The fact that media can so effectively influence our view of an ideal body has little to do with our awareness about photo manipulation. We know full well photos are touched up and fake. In fact we're at the point now where millions of people are so aware of it that they are routinely editing their own photos to match whatever the ideal being pushed at us in the moment is. Maybe that's "instagram face" or giant asses, hell I remember when it was heroin chic. The point is that we all know it's fake. It just doesn't matter because media tells us what to like/want regardless.