根据Buffer生成的PixelMap，显示颜色错误

let frameCb = (color: ArrayBuffer, index: number): boolean => { 
  hilog.error(0, "marvel", "generateVideoFrame pts: %{public}d",index); 
  let opts: image.InitializationOptions = { editable: true, pixelFormat: 3, size: { height: param.imgHeight, width: param.imgWidth } } 
  image.createPixelMap(color, opts).then((pixelMap: image.PixelMap) => { 
    console.info('Succeeded in creating pixelmap.'); 
    let packOpts : image.PackingOption = { format:"image/png", quality:98 }; 
    const imagePackerApi = image.createImagePacker(); 
    const context : Context = getContext(this); 
    const path : string = context.cacheDir + "/pixel_map.jpg"; 
    let file = fs.openSync(path, fs.OpenMode.CREATE | fs.OpenMode.READ_WRITE); 
    imagePackerApi.packToFile(pixelMap, file.fd, packOpts).then(() => { 
      console.info('Succeeded image/jpeg.'); 
    }).catch((error : BusinessError) => { 
      console.error('Failed to pack the image. And the error is: ' + error); 
    }) 
 
  }).catch((error: BusinessError) => { 
    console.error('Failed to create pixelmap.'); 
  }) 
  return false; 
};