Thanks! By the way, I realised just now I was leaving a bit of performance on the table: getImageData() is slow, but I don't need to do it on click, I can do it

Thanks! By the way, I realised just now I was leaving a bit of performance on the table: getImageData() is slow, but I don't need to do it on click, I can do it just once after loading the image. Changing that gets it to be consistently under 100ms for clicks after the first one.