Why Drawing Canvas Pixel Reading Always Return Zero?

Hi,

I am trying to use drawing canvas to read pixel color, but it is always returning "0".

Here is the Drawing Canvas Noise Example File i edited to recreate this.

https://drive.google.com/open?id=1ioYNnQpUFBI4ok7lZzahBC6u1fjrXfTJ

The events changed look like this

Please tell me if i am doing anything wrong here.(Using this plugin first time)

You're reading a pixel value before anything has been drawn to the canvas.

Got it Thanks!