Re: How do I rotate a image pointed to by a CGImageRef
CIFilter *transform = [CIFilter filterWithName:@"CIAffineTransform"];
[transform setValue:img forKey:@"inputImage"];
NSAffineTransform *affineTransform = [NSAffineTransform transform];
[affineTransform rotateByDegrees:90];
[transform setValue:affineTransform forKey:@"inputTransform"];
CIImage * result = [transform valueForKey:@"outputImage"];
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