lambda-watermark (forked)

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.

Note: this is a forked version of lamda-watermark. Changes include:

• addition of "position" property to the options object
• addition of "uploadACL" property to the options object
  • This allows you to specify the permissions of the newly created object
• use of an environment variable to specify destination S3 bucket
• additional logging

How to use

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

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

var options = {
  watermarkImagePath: './watermark.png',
  relativeSize: 5,
  opacity: 50,
  position: 'Center',
  watermarkedImageACL: 'public-read'
}

exports.handler = function(event, context) {
  console.log('🚨 New image detected!')
  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
• specify the destination bucket as an environment variable

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)
• position: Where the watermark should be located on the image. (options are NorthWest|North|NorthEast|West|Center|East|SouthWest|South|SouthEast)
• watermarkedImageACL: ACL permissions on the final, watermarked image (i.e. 'public-read')