使用GPUImage 的 GPUImageChromaKeyBlendFilter 将绿色背景替换为透明背景。

代码

    // 准备一张透明的图片
    UIImage *transparentImg= [UIImage imageNamed:@"MTransparent"];
    
    // 待处理的图片
    UIImage *inputImage = [UIImage imageNamed:@"input"];
    GPUImagePicture *pic = [[GPUImagePicture alloc] initWithImage:inputImage smoothlyScaleOutput:YES];
    
    // 创建Filter
    GPUImageChromaKeyBlendFilter *filter = [[GPUImageChromaKeyBlendFilter alloc] init];
    [filter setColorToReplaceRed:0.0 green:1.0 blue:0.0];
    [pic addTarget:filter];
    [pic processImage];
    
    // 原始图片
    UIImageView *inputImageView = [[UIImageView alloc] initWithFrame:CGRectMake(50, 200, 100, 100)];
    inputImageView.image = inputImage;
    [self.view addSubview:inputImageView];
    
    // 创建UIImageView 用于呈现结果
    UIImageView *resultImageView = [[UIImageView alloc] initWithFrame:CGRectMake(200, 200, 100, 100)];
    resultImageView.image = [filter imageByFilteringImage:transparentImg];
    [self.view addSubview:resultImageView];

input.png

input.png

效果

image.png