I have been exploring image processing from Nodejs and I came across the Jimp/Lwip/Sharp npm packages. I can do basic operations(scale/crop) on the images using these packages-but looking for good/advanced examples mainly on Sharp package.
Lwip- https://github.com/EyalAr/lwip Sharp -http://sharp.dimens.io/en/stable/api/
The sharp issue tracker is a good place to look, they use it for support too. Search for all issues tagged "question" and you'll get a nice list of sample solutions.