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this.context.drawImage(myimage, 0, 0);
Putting the image on the canvas is pretty well covered all over the web.
But how do I remove it after it’s there?
Option 1:
Draw a rectangle over it of the same color as the background.
Option 2 (works for non-trivial background, but slower):
Get the pixel data from the canvas before drawing the image, then redraw that pixel data to remove the image.