var canvas = document.getElementById('bigCanvas')
,ctx = canvas.getContext('2d');
var tcanvas = document.getElementById('testCanvas')
,tctx = tcanvas.getContext('2d');
var grd = tctx.createRadialGradient(150, 100, 10, 150, 110, 150);
grd.addColorStop(0, "black");
grd.addColorStop(0.15, "blue");
grd.addColorStop(0.3, "cyan");
grd.addColorStop(0.5, "green");
grd.addColorStop(0.7, "yellow");
grd.addColorStop(0.85, "orange");
grd.addColorStop(1, "red");
tctx.fillStyle = grd;
tctx.fillRect(0, 0, 300, 200);
var imageData = tctx.getImageData(0, 0, 300, 200);
// Move imagedata's origin to (-150, -100) on canvas,
// start to put data on canvas at imgae data's (150, 100) and size is 150x100
// => copy rect(150, 100, 150, 100) to canvas' s rect (0, 0, 150, 100)
ctx.putImageData(imageData, -150, -100, 150, 100, 150, 100);
// Move imagedata's origin to (150, 100) on canvas,
//start to put data on canvas at imgae data's (0, 0) and and size is 150x100
// => copy rect(0, 0, 150, 100) to canvas' s rect (150, 100, 150, 100)
ctx.putImageData(imageData, 150, 100, 0, 0, 150, 100);
// Move imagedata's origin to (150, -100) on canvas,
// start to put data on canvas at imgae data's (0, 100) and size is 150x100
// => copy rect(0, 100, 150, 100) to canvas' s rect (150, 0, 150, 100)
ctx.putImageData(imageData, 150, -100, 0, 100, 150, 100);
// Move imagedata's origin to (-150, 100) on canvas,
// start to put data on canvas at imgae data's (200, 0) and size is 100x100
// => copy rect(200, 0, 150, 100) to canvas' s rect (50, 100, 150, 100)
ctx.putImageData(imageData, -150, 100, 200, 0, 100, 100);
<div>Canvas for put ImageData:</div>
<canvas id="bigCanvas" width="300" height="200"></canvas>
<hr/>
<div>Canvas for get ImageData:</div>
<canvas id="testCanvas" width="300" height="200"></canvas>
Спасибо за такой впечатляющий ответ !!! :) – Noitidart