iOS-CIImage autoAdjustmentFilters泄漏

Question

我正在使用自动增强功能来改善很多图像。

但是似乎有很大的泄漏，所以这是我正在使用的代码：

#import <CoreImage/CoreImage.h>
#import <ImageIO/ImageIO.h>

@implementation UIImage (AutoEnhanced)
- (UIImage *)autoEnhancedImage
{
    @autoreleasepool {
        CIImage *ciOriginal = self.CIImage;
        if(!ciOriginal) {
            ciOriginal = [[CIImage alloc] initWithCGImage:self.CGImage];
        }
        NSDictionary *options = @{ CIDetectorImageOrientation : @(self.CGImagePropertyOrientation)};
        NSArray *adjustments = [ciOriginal autoAdjustmentFiltersWithOptions:options];
        for (CIFilter *filter in adjustments) {
            [filter setValue:ciOriginal forKey:kCIInputImageKey];
            ciOriginal = filter.outputImage;
        }
        CIContext *context = [CIContext contextWithOptions:nil];
        CGImageRef cgImage = [context createCGImage:ciOriginal fromRect:ciOriginal.extent];
        UIImage *enhancedImage = [[UIImage alloc] initWithCGImage:cgImage];
        CGImageRelease(cgImage);
        return enhancedImage;
    }
}

- (CGImagePropertyOrientation)CGImagePropertyOrientation
{
    switch (self.imageOrientation) {
        case UIImageOrientationUp:
            return kCGImagePropertyOrientationUp;
        case UIImageOrientationUpMirrored:
            return kCGImagePropertyOrientationUpMirrored;
        case UIImageOrientationDown:
            return kCGImagePropertyOrientationDown;
        case UIImageOrientationDownMirrored:
            return kCGImagePropertyOrientationDownMirrored;
        case UIImageOrientationLeftMirrored:
            return kCGImagePropertyOrientationLeftMirrored;
        case UIImageOrientationRight:
            return kCGImagePropertyOrientationRight;
        case UIImageOrientationRightMirrored:
            return kCGImagePropertyOrientationRightMirrored;
        case UIImageOrientationLeft:
            return kCGImagePropertyOrientationLeft;
    }
}
@end 

这是Instruments的日志：

即使使用自动释放池，我也无法修复它。任何想法将不胜感激！谢谢！