iOS 影像處理－調整映像亮度

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- (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;}

參考連結：

http://www.raywenderlich.com/22167/beginning-core-image-in-ios-6

http://blog.csdn.net/willyang519/article/details/38716019

iOS 影像處理－調整映像亮度