image_extraction.md

Image extraction

Supported since v0.7.0

Resulting images can be extracted into the file system with onExtractImage prop. It returns path to a temporary file inside cache folder that contains filtering result and triggers when extractImageEnabled changes to true. While extractImageEnabled remains truthy onExtractImage will trigger every time filtering result changes. To delete all temporary files created this way you need to call cleanExtractedImagesCache function. Since these files are saved to cache folder they can be removed by user or system at any time. Usage example.

<Grayscale
  style={styles.image}
  onFilteringError={
    ({ nativeEvent }) => dispatch(['show-error', new Error(nativeEvent.message)])
  }
  onExtractImage={({ nativeEvent }) => dispatch(['save-photo', nativeEvent.uri])}
  extractImageEnabled={true}
  image={
    <Image
      style={styles.image}
      source={{ uri: state[1] }}
    />
  }
/>