用户在黑色布的背景下拍摄照片（只有人脸部分），需要把人脸部分抠出来放在透明背景中用在别的地方。
我现在是用CubeMap实现，传的要消除的颜色的hsv范围是

CubeMap myCube = createCubeMap(0,41);

但是会把眉毛和嘴巴也抠去，大家还有别的实现思路吗？？？

代码如下

//原图 UIImageView *myImageView = [[UIImageView alloc]initWithFrame:CGRectMake(10, 100, 300, 300)]; myImageView.backgroundColor = [UIColor clearColor]; myImageView.image = [UIImage imageNamed:@"WechatIMG1.jpeg"]; [self.view addSubview:myImageView]; //创建透明背景图片 UIGraphicsBeginImageContextWithOptions(CGSizeMake(300, 300), NO, 0.0); UIImage *blank = UIGraphicsGetImageFromCurrentImageContext(); UIGraphicsEndImageContext(); //背景图片 UIImage *backgroundImage = blank; //要消除的颜色的hsv值范围 CubeMap myCube = createCubeMap(0,41); NSData *myData = [[NSData alloc]initWithBytesNoCopy:myCube.data length:myCube.length freeWhenDone:true]; //消除过程 CIFilter *colorCubeFilter = [CIFilter filterWithName:@"CIColorCube"]; [colorCubeFilter setValue:[NSNumber numberWithFloat:myCube.dimension] forKey:@"inputCubeDimension"]; [colorCubeFilter setValue:myData forKey:@"inputCubeData"]; [colorCubeFilter setValue:[CIImage imageWithCGImage:myImageView.image.CGImage] forKey:kCIInputImageKey]; //消除后的图片 CIImage *outputImage = colorCubeFilter.outputImage; CIFilter *sourceOverCompositingFilter = [CIFilter filterWithName:@"CISourceOverCompositing"]; [sourceOverCompositingFilter setValue:outputImage forKey:kCIInputImageKey]; [sourceOverCompositingFilter setValue:[CIImage imageWithCGImage:backgroundImage.CGImage] forKey:kCIInputBackgroundImageKey]; outputImage = sourceOverCompositingFilter.outputImage; CGImage *cgImage = [[CIContext contextWithOptions: nil]createCGImage:outputImage fromRect:outputImage.extent]; //合成图 myImageView.image = [UIImage imageWithCGImage:cgImage];