Image Resizing & Reformatting Lambda Function

The detailed information is available at this link.

Overview

This Lambda function was developed to resize images stored in Amazon S3 to client-specified dimensions and deliver them in a compact, optimized format for efficient viewing.
Since WebP provides a compact image size and efficient performance, it is set as the default output format.

Features

• 📐 Resize images dynamically to user-requested dimensions
• 🔄 Convert images to various formats, with WebP as the default
• ⚡ Optimized for low-latency performance using Lambda@Edge
• ☁️ Integrated with S3 and CloudFront for seamless delivery and caching

Architecture

1. Lambda@Edge with CloudFront:
   When CloudFront receives an origin response, it invokes the Lambda function to resize the image and deliver it with caching.

2. Max Image Dimensions:
   Images are resized to a maximum width or height of 1024px.

3. Error Handling:
   If an error occurs during processing, the original image is returned.

4. CloudFront Caching:
   Processed images are cached for 6 months to reduce latency and costs.

5. Query String Parameters:

   Parameter	Description	Example
   h	Height in pixels	h=800
   w	Width in pixels	w=600
   f	File format (extension)	f=jpeg
   q	Image quality (1–100)	q=80