unn / lambda-watermark

AWS Lambda Watermark service for S3 images

lambda-watermark

Watermarking for images in AWS S3 using AWS Lambda.

This module places a watermark in the bottom right corner of your image. An S3 Lambda event can be used to watermark every image that is uploaded to S3.

How to use

• npm install lambda-watermark
• Create your function (index.js)

'use strict';
var LambdaWatermark = require('lambda-watermark');

var options = {
  watermarkImagePath: './exampleWatermark.png',
  relativeSize: 5,
  opacity: 50
};

exports.handler = function(event, context) {
  new LambdaWatermark(options)(event, context);
};

• Set up Lambda service on AWS
• Zip up your directory (index.js, watermark image, and node_modules) and upload to your AWS Lambda function

Configuration (options)

• watermarkImagePath: The relative path to your image
• relativeSize: The size of the watermark (percent relative to the parent image)
• opacity: How opaque the watermark should be. (100 is fully opaque, 0 is fully transparent)