Is there any way to get all data from image?

Question

I tried canvas but can't find if there is any way to get all data, there is only single pixel information.

I'm working on image Decryption/Encryption methods, but first I want to get all image data at once, please anyone help.

user_7599833 · Answer

Extending on my comment...

I'm not sure what you mean by "get all image data at once" the getImageData can return as much or little as you need, and it certainly is at once, we don't need to make multiple calls, we just change the parameters.
read more:
https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/getImageData

If you need the entire canvas you can do: ctx.getImageData(0, 0, c.width, c.height)

var output = document.getElementById("output");
var ctx_output = output.getContext("2d");

var c = document.getElementById("myCanvas");
var ctx = c.getContext("2d");
ctx.fillStyle = "red";
ctx.fillRect(10, 10, 80, 80);
ctx.fillRect(99, 20, 20, 20);

function copy() {
  var imgData = ctx.getImageData(0, 0, c.width, c.height);
  ctx_output.putImageData(imgData, 0, 0);
}

Is there any way to get all data from image?

1 Answers