return a black screen when convert canvas to image

Platform: Android

Expected behavior

screenshot of canvas

Actual behavior

return a black screen

In my render() method

<ViewShot ref="viewShot" options={{ format: "jpg", quality: 0.9, result: "base64" }}>
    <View collapsable={false}>
        <Canvas ref={this.mycanvas} style={{ width: deviceWidth, height: canvasHeight }} crossOrigin="Anonymous" 
        />
     </View>
</ViewShot>

method to capture

this.refs.viewShot.capture().then(uri => {
    console.log("do something with ", uri);
}

[sobanarshad85]

repalce your format jpg to png or any other and it’s done

[obiwankenoobi]

@dean9703111 found a solution