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Image Sources

checkFace() accepts a local image URI. Here are the supported sources and formats.

Supported URI Formats​

FormatExampleiOSAndroid
file:// URIfile:///path/to/image.jpg✅✅
Plain file path/path/to/image.jpg✅✅
content:// URIcontent://media/...❌✅

Common Sources​

expo-image-picker​

The most common source. Both launchImageLibraryAsync and launchCameraAsync return a file:// URI.

import * as ImagePicker from 'expo-image-picker';
import { checkFace } from 'expo-face-check';

const result = await ImagePicker.launchImageLibraryAsync({
  mediaTypes: ['images'],
  quality: 1,
});

if (!result.canceled) {
  const faceResult = await checkFace(result.assets[0].uri);
}

expo-camera​

If you capture a photo using expo-camera, the returned URI works directly:

const photo = await cameraRef.current.takePictureAsync();
const faceResult = await checkFace(photo.uri);

expo-file-system​

Any file managed by expo-file-system can be checked:

import * as FileSystem from 'expo-file-system';
import { checkFace } from 'expo-face-check';

const fileUri = FileSystem.documentDirectory + 'photo.jpg';
const faceResult = await checkFace(fileUri);

Tips​

  • Use full-resolution images — Higher resolution images produce more accurate face detection results
  • Supported formats — JPEG, PNG, and other standard image formats supported by the platform
  • Remote URLs are not supported — Download the image to a local file first using expo-file-system before passing it to checkFace()