[iOS]CIFilter濾鏡，ioscifilter濾鏡

[iOS]CIFilter濾鏡，ioscifilter濾鏡

- (void)viewDidLoad{    [super viewDidLoad];    // Do any additional setup after loading the view, typically from a nib.        // 濾鏡效果    NSArray *operations = @[@"CILinearToSRGBToneCurve",                            @"CIPhotoEffectChrome",                            @"CIPhotoEffectFade",                            @"CIPhotoEffectInstant",                            @"CIPhotoEffectMono",                            @"CIPhotoEffectNoir",                            @"CIPhotoEffectProcess",                            @"CIPhotoEffectTonal",                            @"CIPhotoEffectTransfer",                            @"CISRGBToneCurveToLinear",                            @"CIVignetteEffect"];        CGFloat width = self.view.frame.size.width/3;    CGFloat height = self.view.frame.size.height/4;        NSMutableArray *imageViews = [NSMutableArray arrayWithCapacity:0];        for (int i = 0; i < [operations count]; i++)    {        UIImageView *imageView = [[UIImageView alloc]initWithFrame:                                  CGRectMake(i%3*width, i/3*height, width, height)];        imageView.image = [UIImage imageNamed:@"timg.jpeg"];        [imageViews addObject:imageView];        [self.view addSubview:imageView];    }        dispatch_async(dispatch_get_global_queue(0, 0),^{                NSMutableArray *images = [NSMutableArray arrayWithCapacity:0];                for (int i = 0; i < [operations count]; i++)        {            UIImage *image = [UIImage imageNamed:@"timg.jpeg"];            CIImage *cImage = [[CIImage alloc]initWithImage:image];                        //使用資源            CIFilter *filter = [CIFilter filterWithName:operations[i]                                          keysAndValues:kCIInputImageKey,cImage, nil];                        //使用預設參數            [filter setDefaults];                        //產生上下文            CIContext*context = [CIContext contextWithOptions:nil];                        //濾鏡產生器輸出圖片            CIImage *outputimage = [filter outputImage];                        //轉換為UIImage            CGImageRef ref = [context createCGImage:outputimage fromRect:[outputimage extent]];            UIImage *temp = [UIImage imageWithCGImage:ref];                        [images addObject:temp];                        //釋放            CGImageRelease(ref);        }                dispatch_async(dispatch_get_main_queue(), ^{            for (int x = 0; x < [images count]; x++)            {                UIImageView *imageView = imageViews[x];                imageView.image = images[x];            }        });    });}

原圖

添加濾鏡後