iOS 影像處理－調整映像亮度

iOS 影像處理－調整映像亮度

- (UIImage*) getBrighterImage:(UIImage *)originalImage{    UIImage *brighterImage;    CIContext *context = [CIContext contextWithOptions:nil];    CIImage *inputImage = [CIImage imageWithCGImage:originalImage.CGImage];    CIFilter *lighten = [CIFilter filterWithName:@CIColorControls];    [lighten setValue:inputImage forKey:kCIInputImageKey];    [lighten setValue:@(0.3) forKey:@inputBrightness];        CIImage *result = [lighten valueForKey:kCIOutputImageKey];    CGImageRef cgImage = [context createCGImage:result fromRect:[inputImage extent]];    brighterImage = [UIImage imageWithCGImage:cgImage];    CGImageRelease(cgImage);        return brighterImage;}