I wanted to see how the new controls would work with a full screen photo. I think there can be cases where the white icons and text are not legible. This photo turned out ok, but not all will.
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Maybe instead the top icons can be encircled with a blurred. This will make them more visible, but not too prominent that it get's distracting, although it's starting too. But, Apple only uses blur to show depth (Mike Stern was saying how he hated seeing apps use blur only for style) and there's really no depth here to show.
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Or they could just be encircled in white, but here the screen becomes far too cluttered.
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I think having these controls compete with the photo makes the controls on one hand too hard to read if they are kept subtle, or makes the screen too busy if they are made more prominent. The actual screen 7.1 ended up with is much more simple because nothing competes. The rectangles worked because the 4 separate ones created one structure. 4 circles don't simplify to another shape, so it ends up looking busy.