iOS 图片添加滤镜

对目标图片添加滤镜

使用CoreImage框架为图片添加滤镜
创建UIImage的category，这样想要添加滤镜的图片直接调用下面的方法就可以了。

	- (UIImage *)addFilterWithName:(NSString *)filterName {
    UIImageView *theImageViewBack = [[UIImageView alloc]init];
    theImageViewBack.image = self;
    
    CIImage * inputImage = [CIImage imageWithCGImage:theImageViewBack.image.CGImage];
    

        //2.创建CIFilter对象
        CIFilter * filter = [CIFilter filterWithName:filterName];
        //3.设置默认参数
        [filter setDefaults];
        
        //4.设置要处理的图像
        [filter setValue:inputImage forKey:@"inputImage"];
        
        //5.得到处理后的图像

        CIImage * outImage = filter.outputImage;
    
        [filter setValue:outImage forKey:kCIInputImageKey];
           
       // 在这里创建上下文 把滤镜和图片进行合并
       CIContext *context = [CIContext contextWithOptions:nil];
       CGImageRef resultImage = [context createCGImage:filter.outputImage fromRect:filter.outputImage.extent];
    //这里返回的图像已经是添加了滤镜效果的图像了
    return [UIImage imageWithCGImage:resultImage];
}

常用滤镜

@"CIPhotoEffectNoir",
                                                @"CIPhotoEffectInstant",
                                                @"CIPhotoEffectProcess",
                                               @"CIPhotoEffectFade",
                                                @"CIPhotoEffectTonal",
                                                @"CIPhotoEffectMono",
                                                @"CIPhotoEffectChrome",
                                                @"CISepiaTone",
                                              @"CIMedianFilter",
                                                @"CINoiseReduction",
                                                @"CIColorMonochrome",
                                                @"CIColorPosterize",
                                                @"CIFalseColor",
                                                @"CIMaximumComponent",
                                                @"CIMinimumComponent",
                                                @"CIPhotoEffectChrome"

滤镜官网文档

本文地址：https://blog.csdn.net/qq_41113499/article/details/107253741