Javascript Project to Remove Background of Bulk Images Using URL in TextArea in Browser

Welcome folks today in this blog post we will be removing background of bulk images from url’s in Textarea in browser using javascript. All the full source code of the application is shown below.

Get Started

In order to get started you need to make an index.html file and copy paste the following code

index.html

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Remove Background of Bulk Images</title>
</head>
<style>
    body {
        margin: 0;
        background-color: yellow;
        display: flex;
        justify-content: center;
        align-items: center;
        height: 100vh
    }
</style>
<body>
    <textarea name="" id="urls" cols="30" rows="5"></textarea>
    <button onclick="removebackground()">Remove Background From Images</button>
</body>
</html>

<!DOCTYPE html>

<head>

<title>Remove Background of Bulk Images</title>

</head>

<style>

body {

margin: 0;

background-color: yellow;

display: flex;

justify-content: center;

align-items: center;

height: 100vh

}

</style>

<body>

<button onclick="removebackground()">Remove Background From Images</button>

</body>

</html>

As you can see we have written the html code in which we have the textarea widget where users will write the image urls to remove the background of bulk images. And then we have the simple button to call a external function called removebackground() . Now we need to define this function inside the javascript code as shown below

script.js

function removebackground() {
        let images = document.getElementById('urls').value.split('\n')

        images.forEach(imageUrl => {
            const image = new Image();
            image.onload = ({ target }) => {
                const w = Math.round(target.width);
                const h = Math.round(target.height);

                const canvas = document.createElement("canvas");
                canvas.width = w;
                canvas.height = h;
                const canvasContext = canvas.getContext("2d");
                canvasContext.drawImage(
                    target,
                    0,
                    0,
                    target.width,
                    target.height,
                    0,
                    0,
                    w,
                    h
                );

                const canvasImageData = canvasContext.getImageData(0, 0, w, h);

                for (
                    let index = 0, dataLength = canvasImageData.data.length;
                    index < dataLength;
                    index += 4
                ) {
                    const r = canvasImageData.data[index];
                    const g = canvasImageData.data[index + 1];
                    const b = canvasImageData.data[index + 2];
                    if ([r, g, b].every((item) => item > 230))
                        canvasImageData.data[index + 3] = 0;
                }

                target.width = w;
                target.height = h;
                canvasContext.putImageData(canvasImageData, 0, 0);
                document.body.append(image, canvas);
            };
            image.crossOrigin = "";
            image.src = imageUrl;
        });
    }

function removebackground() {

let images = document.getElementById('urls').value.split('\n')

images.forEach(imageUrl => {

const image = new Image();

image.onload = ({ target }) => {

const w = Math.round(target.width);

const h = Math.round(target.height);

const canvas = document.createElement("canvas");

canvas.width = w;

canvas.height = h;

const canvasContext = canvas.getContext("2d");

canvasContext.drawImage(

target,

target.width,

target.height,

);

const canvasImageData = canvasContext.getImageData(0, 0, w, h);

for (

let index = 0, dataLength = canvasImageData.data.length;

index < dataLength;

index += 4

) {

const r = canvasImageData.data[index];

const g = canvasImageData.data[index + 1];

const b = canvasImageData.data[index + 2];

if ([r, g, b].every((item) => item > 230))

canvasImageData.data[index + 3] = 0;

}

target.width = w;

target.height = h;

canvasContext.putImageData(canvasImageData, 0, 0);

document.body.append(image, canvas);

};

image.crossOrigin = "";

image.src = imageUrl;

});

}

As you can see we are getting the urls from the textarea and basically we are using the split() function to split the result coming from the textarea into multiple lines. And then we are using the canvas element to draw the image on the canvas after removing the background from the images.