HTML canvas createImageData() Method

The createImageData() method is used to create a new blank ImageData object. The pixels of the new object is transparent black by default.

There are two syntaxes of the createImageData() method:

It is used to create a new ImageData object with the specified dimensions(in pixels):
Syntax:
```
var imgData = context.createImageData(width, height);
```
It is used to create a new ImageData object with the same dimensions as the object specified by anotherImageData. It doesn’t copy the image data.
Syntax:
```
var imgData=context.createImageData(imageData);
```

Parameter Values:

width: It denotes the width(in pixels) of the new ImageData object.
height: It denotes the height(in pixels) of the new ImageData object.
imageData: It is the anotherImageData object

Example:

<!DOCTYPE html> 

<html> 

<body> 

    <h3 style="color:green">GeeksforGeeks</h3> 

    <h3>HTML canvas createImageData() Method</h3> 

    <canvas id="myCanvas"

            width="200"

            height="200"

            style="border:2px solid ;"> 

  </canvas> 

    <p id=g eeks></p> 

    <script> 

        var can = document.getElementById("myCanvas"); 

        var gfg = can.getContext("2d"); 

        var imgData = gfg.createImageData(150, 100); 

        var i; 

        for (i = 0; i < imgData.data.length; i += 3) { 

            imgData.data[i + 0] = 100; 

            imgData.data[i + 1] = 0; 

            imgData.data[i + 2] = 0; 

        } 

        gfg.putImageData(imgData, 10, 10); 

    </script> 

</body> 

</html>

Output:

Supported Browsers:

Chrome
Mozilla Firefox
Internet Explorer 9.0
Opera
Safari

Article Tags :

HTML

Web Technologies

HTML-Methods