Canvas UI - Get Pixel Colour from Image

Hello,

I want to get the pixel colour of the image that has been selected within Canvas UI. If I was using a normal Physics Raycaster, I would use 'hit.textureCoord', however I can't seem to access the 'hit' of the UI Graphics Raycaster.

This is called when the image is tapped on;

 public void OnTapImage(BaseEventData _data){
 
         PointerEventData _pointer = _data as PointerEventData;
 
 }

'_pointer' has 'pointerCurrentRaycast' as a sub-class, but it doesn't seem to have much regarding the Hit data, thus I cannot get 'textureCoord'. (unless I'm missing something?).

I could use mousePosition, and grab the pixel data it is currently over, but this will not work for Alpha/Transparent data. And this is key! I need to be able to check what the alpha level is on the image the user is selecting.

Any ideas? Thanks.