- (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;

}

參考链接：

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

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