Objective-c Apply Blending mode to an image

gistfile1.m

- (UIImage *)createDimImage:(UIImage *)image; {

    CGSize size   = image.size;
    CGRect bounds = CGRectMake(0, 0,size.width, size.height);
    UIImage * dimImage;

    UIGraphicsBeginImageContextWithOptions(size, NO, 0.0f);
    [msColorNeutralLight setFill];
    UIRectFill(bounds);
    [image drawInRect:bounds blendMode:kCGBlendModeMultiply alpha:1.0f];
    dimImage = UIGraphicsGetImageFromCurrentImageContext();
    UIGraphicsEndImageContext();

    return dimImage;
}