Install
This is the repository archive. It installs, but the folder name will carry the branch suffix and updates will not flow.
Install straight from GitHub with WP-CLI:
wp plugin install https://github.com/plethoralabs/process-image-after-upload/archive/refs/heads/master.zipNo built-in updater. New versions won't appear under Dashboard → Updates. Install new releases yourself, or let Git Updater track the repository.
Wordpress plugin for post-upload image processing
Currently supports Auto-levels and sharpen filters.
Before Upload

After Upload (with Auto-Levels and Sharpen filters applied)

Attributions
This plugin was based on the Resize Image After Upload wordpress plugin.
The auto-levels filter was adapted from JavaScript, from the auto-color-level code by AJ Farkas.
Sample image provided by Anestis Samourkasidis.