This is really smart & very much needed. There are services that do this (we use imgix for PH), but for people just starting out who don't have a budget, this looks like a good quick / less feature rich solution.
It's certainly superior to cropping/resizing on upload. You never really know what sizes you'll need. If you made a mistake in choosing... then you have to reprocess all previously uploaded images (nightmare!)
Could probably stick a CDN in front of this as well (such as cloudflare).
I've been searching in vain for something similar to this that can also handle WebP, JPEG 2000, and JPEG XR. Imgix works beautifully, but their pricing-per-image is hurting us. Sadly this doesn't seem to support any of the above.
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Great, very nice to Open Source it !
I like AWS Lambda for image processing, especially with event-sources (-> S3 upload), see http://docs.aws.amazon.com/lambd...
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