消除图片特定颜色实现截取效果

原帖：http://blog.youkuaiyun.com/zhangao0086/article/details/39120331

关键代码：

 

    

    struct CubeMap cubeMap = createCubeMap(180,240);

  

    NSData *data_=[NSData dataWithBytesNoCopy:cubeMap.data length:(int)cubeMap.length freeWhenDone:true];

   

    CIFilter *colorCubeFilter =[CIFilter filterWithName:@"CIColorCube"];

    

    [colorCubeFilter setValue:@(cubeMap.dimension) forKey:@"inputCubeDimension"];

    [colorCubeFilter setValue:data_ forKey:@"inputCubeData"];

    [colorCubeFilter setValue:[[CIImage alloc]initWithImage:self.imageView.image] forKey:kCIInputImageKey];

 

    

    CIImage *outputImage=colorCubeFilter.outputImage;

    

    self.out_ImageView.image=[[UIImage alloc]initWithCIImage:outputImage];

    

    

    CIFilter *sourceOverCompositingFilter=[CIFilter filterWithName:@"CISourceOverCompositing"];

    [sourceOverCompositingFilter setValue:outputImage forKey:kCIInputImageKey];

    [sourceOverCompositingFilter setValue:[[CIImage alloc]initWithImage:[UIImage imageNamed:@"test4_xiao"]] forKey:kCIInputBackgroundImageKey];

    outputImage=sourceOverCompositingFilter.outputImage;

    

     NSLog(@"new_cgimage:%@",outputImage);

 

    

    UIImage *nsImage2=[[UIImage alloc] initWithCIImage:outputImage];

        NSLog(@"nsImage2:%@",nsImage2);

    CGImageRef new_cgimage=nsImage2.CGImage;

    NSLog(@"new_cgimage:%@",new_cgimage);

    CGImageRef  this_cgimage = CGImageCreateWithImageInRect(new_cgimage, outputImage.extent);

   

    self.imageView.image=nsImage2;