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How to add watermark to images using Node.js

高洛峰
Release: 2017-02-04 10:20:46
Original
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1. Preparation:

First, make sure you have installed the node environment locally.

Then, we need to use a Node.js library for image editing operations: images.

The address of this library is: https://github.com/zhangyuanwei/node-images. The author defines it as "Node.js lightweight cross-platform image encoding and decoding library" and provides a series of interface.

The first thing we need to do is to install the images library:

npm install images

Second, go directly to the DEMO:

The steps are as follows:

step1: Folder structure

How to add watermark to images using Node.js

step2: JS code

var images = require('images');
var path = require('path');
var watermarkImg = images('water_logo.png');
var sourceImg = images('source.png');
// 比如放置在右下角,先获取原图的尺寸和水印图片尺寸
var sWidth = sourceImg.width();
var sHeight = sourceImg.height();
var wmWidth = watermarkImg.width();
var wmHeight = watermarkImg.height();
images(sourceImg)
// 设置绘制的坐标位置,右下角距离 40px
.draw(watermarkImg, sWidth - wmWidth - 40, sHeight - wmHeight - 40)
// 保存格式会自动识别
.save('saveimg.png');
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step3: Run node app Command

How to add watermark to images using Node.js

step4: After running the node command, the folder structure is as shown below

How to add watermark to images using Node.js

step5: The final generated watermark Picture

How to add watermark to images using Node.js

The above is the method introduced by the editor to add watermark to pictures using Node.js. I hope it will be useful to everyone. For help, if you have any questions please leave me a message and the editor will reply to you in time. I would also like to thank you all for your support of the PHP Chinese website!

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