JPEG library is a free library with functions for handling the JPEG image data format.
The libjpeg coming with Fedora/CentOS project (libjpeg-turbo) only provides v6 implementation of JPEG (aka. libjpeg.so.62). This project is provided as dependencies for various other projects which need libjpeg.so.7, libjpeg.so.8, etc.
This is a companion discussion topic for the original entry at https://copr.fedorainfracloud.org/coprs/aflyhorse/libjpeg/