lambda-watermark's Introduction

lambda-watermark (forked)

This module places a watermark in the chosen position of your image. An S3 Lambda event can be used to watermark every image that is uploaded to S3 and to save it as an altered version retaining the original file.

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

ability to position water mark
ability to set the permissions of your created file
set destination S3 bucket and path
save a version of the file as '-watermarked' to retain the original
logging

How to use

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

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

var options = {
  watermarkImagePath: './exampleWatermark.png',
  relativeSize: 5,
  watermarkWidth: 250,
  watermarkHeight: 133,
  opacity: 50,
  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
watermarkWidth: Width of the watermark image
watermarkHeight: Height of the watermark 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')

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