-(instancetype)darkened:(CGFloat)alpha andBlurredImage:(CGFloat)radius blendModeFilterName:(NSString *)blendModeFilterName {

    CIImage *inputImage = [[CIImage alloc] initWithImage:self];

    CIContext *context = [CIContext contextWithOptions:nil];

    //First, create some darkness
    CIFilter* blackGenerator = [CIFilter filterWithName:@"CIConstantColorGenerator"];
    CIColor* black = [CIColor colorWithRed:0.0f green:0.0f blue:0.0f alpha:alpha];
    [blackGenerator setValue:black forKey:@"inputColor"];
    CIImage* blackImage = [blackGenerator valueForKey:@"outputImage"];

    //Second, apply that black
    CIFilter *compositeFilter = [CIFilter filterWithName:blendModeFilterName];
    [compositeFilter setValue:blackImage forKey:@"inputImage"];
    [compositeFilter setValue:inputImage forKey:@"inputBackgroundImage"];
    CIImage *darkenedImage = [compositeFilter outputImage];

    //Third, blur the image
    CIFilter *blurFilter = [CIFilter filterWithName:@"CIGaussianBlur"];
    [blurFilter setDefaults];
    [blurFilter setValue:@(radius) forKey:@"inputRadius"];
    [blurFilter setValue:darkenedImage forKey:kCIInputImageKey];
    CIImage *blurredImage = [blurFilter outputImage];

    CGImageRef cgimg = [context createCGImage:blurredImage fromRect:inputImage.extent];
    UIImage *blurredAndDarkenedImage = [UIImage imageWithCGImage:cgimg];
    CGImageRelease(cgimg);

    return blurredAndDarkenedImage;
}