compositingFilterproperty that will handle just that.
All it takes is
myLayer.compositingFilter = [CIFilter filterWithName:@"CIAdditionCompositing"]; and
myLayer will be compositing on top of the previous layer in the layer tree. Varying
myLayer.opacity will give the same result as in photoshop, changing the opacity of the composited image.
There still is the limitation of the GPU texture size, so this won't handle big (2000+x2000+ ?) images. Maybe
CATiledLayer can be of some help there ?
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