let canvas = document.createElement("canvas")

let width = 3460;

let height = 2160;

canvas.width = width;

canvas.height = height;

let canvas2 = new OffscreenCanvas(width, height)

let ctx = canvas.getContext('2d')

let ctx2 = canvas2.getContext('2d')

let imageData = new ImageData(width,height);

ctx.putImageData(imageData,0, 0);

document.body.append(canvas)

ctx2.putImageData(imageData,0 ,0)

window.ctx = ctx;

window.ctx2 = ctx2

window.width = width;

window.height = height;