While this is using a library for the image processing I am not sure this is possible. Please your advise
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I created a quick example to resize an image here https://github.com/rabbah/functions/tree/master/sharp. You can deploy this from App Platform or with the CLI using
doctl serverless(download here).
Open the URL in your browser and add a query parameter
url=https://images.pexels.com/photos/86405/penguin-funny-blue-water-86405.jpegto see the resized result.