Example
The code below copies the pixel data for a specified rectangle on the canvas with getImageData(), and then put the image data back onto the canvas with putImageData():
var c=document.getElementById("myCanvas");
var ctx=c.getContext("2d");
ctx.fillStyle="red";
ctx.fillRect(10,10,50,50);
function copy()
{
var imgData=ctx.getImageData(10,10,50,50);
ctx.putImageData(imgData,10,70);
}
Try it Yourself »
Browser Support
The numbers in the table specify the first browser version that fully supports the method.
| Method | |||||
|---|---|---|---|---|---|
| putImageData() | Yes | 9.0 | Yes | Yes | Yes |
Definition and Usage
The putImageData() method puts the image data (from a specified ImageData object) back onto the canvas.
Tip: Read about the getImageData() method that copies the pixel data for a specified rectangle on a canvas.
Tip: Read about the createImageData() method that creates a new, blank ImageData object.
JavaScript Syntax
| JavaScript syntax: | context.putImageData(imgData,x,y,dirtyX,dirtyY,dirtyWidth,dirtyHeight); |
|---|
Parameter Values
| Parameter | Description |
|---|---|
| imgData | Specifies the ImageData object to put back onto the canvas |
| x | The x-coordinate, in pixels, of the upper-left corner of the ImageData object |
| y | The y-coordinate, in pixels, of the upper-left corner of the ImageData object |
| dirtyX | Optional. The horizontal (x) value, in pixels, where to place the image on the canvas |
| dirtyY | Optional. The vertical (y) value, in pixels, where to place the image on the canvas |
| dirtyWidth | Optional. The width to use to draw the image on the canvas |
| dirtyHeight | Optional. The height to use to draw the image on the canvas |