Overlay layer on photo, and export result at higher resolution than the native display

I want to take a photo with the device's camera, overlay a CALayer on top of it, and export the photo at the native resolut开发者_如何学Cion of the device's camera.

The best solution i could come up with so far, was to overlay the CALayer on top of the UIView, and capture the current view state using [CALayer renderInContext:]. However the result of this will be at the devices native screen resolution, not the original resolution of the camera.

Any better suggestions?

Thanks as always

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What you actually want to do in this situation is draw the image offscreen using core graphics. Slightly more complicated, but the best solution I have found.