Android Question Firebase Vision Facedetect and capture image

Hi,

I'm using this library : https://www.b4x.com/android/forum/t...contour-recognition-and-imagelabeling.105501/

My app can do face recognition or face contour successfully, but how can i save image from preview without face map data? I want to save it as a plain image (jpg or pgn is okay).. appreciate any help.