I have a UIImage which is loaded from a CIImage with:
tempImage = [UIImage imageWithCIImage:ciImage];
The problem is I need to crop tempImage
to a specific CGRect
and the only way I know how to do this is by using CGImage
.
The problem is that in the iOS 6.0 documentation I found this:
CGImage
If the UIImage object was initialized using a CIImage object, the value of the property is NULL.
A. How to convert from CIImage to CGImage? I'm using this code but I have a memory leak (and can't understand where):
+(UIImage*)UIImageFromCIImage:(CIImage*)ciImage {
CGSize size = ciImage.extent.size;
UIGraphicsBeginImageContext(size);
CGRect rect;
rect.origin = CGPointZero;
rect.size = size;
UIImage *remImage = [UIImage imageWithCIImage:ciImage];
[remImage drawInRect:rect];
UIImage *result = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
remImage = nil;
ciImage = nil;
//
return result;
}
Swift 3, Swift 4 and Swift 5
Here is a nice little function to convert a CIImage
to CGImage
in Swift.
func convertCIImageToCGImage(inputImage: CIImage) -> CGImage? {
let context = CIContext(options: nil)
if let cgImage = context.createCGImage(inputImage, from: inputImage.extent) {
return cgImage
}
return nil
}