Get pixel color from HTML canvas

To get the pixel color from the canvas, use the following code. This will return the color in rgba -

var index = (Math.floor(y) * canvasWidth + Math.floor(x)) * 4

// color in rgba
var r = data[index]
var g = data[index + 1]
var b = data[index + 2]
var a = data[index + 3]

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