How is Tmall's picture compression strategy solved?

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the same picture can be compressed into different sizes or even different types of pictures according to the following parameters. How is this done

https://img.alicdn.com/imgextra/i1/2064892827/TB20kU.iLxNTKJjy0FjXXX6yVXa_!!2064892827.jpg_490x490q100.jpg_.webp  https://img.alicdn.com/imgextra/i1/2064892827/TB20kU.iLxNTKJjy0FjXXX6yVXa_!!2064892827.jpg_490x490q100.jpg    https://img.alicdn.com/imgextra/i1/2064892827/TB20kU.iLxNTKJjy0FjXXX6yVXa_!!2064892827.jpg

Server-side compression images

Mar.05,2021

server processing, that's just a parameter. The server cuts the image according to your parameters

probably studies the thumbnail of nginx configuration image. https://github.com/oupula/ngx.

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