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HTML canvas putImageData() Method

HTML canvas Reference HTML Canvas Reference

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);
}
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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

HTML canvas Reference HTML Canvas Reference