av01d

function convertImageToCanvas(image) {
  var canvas = document.createElement("canvas");
  canvas.width = image.width;
  canvas.height = image.height;
  canvas.getContext("2d").drawImage(image, 0, 0);
  return canvas;
}

function convertCanvasToImage(canvas) {
  var image = new Image();

av01d

/* HTML:
<input type="file" id="filepicker">
<canvas id="outCanvas"></canvas>
*/

filepicker.addEventListener("change", () => {
  createImageBitmap(filepicker.files[0])
    .then(response => {
      outCanvas.width = response.width;
      outCanvas.height = response.height;