Fix the WordPress Error: Post-Processing of the Image Failed Likely Because the Server is Busy

Motivation

When you get the error
“Post-processing of the image likely failed because the server is busy or does not have enough resources.
Uploading a smaller image may help. Suggested maximum size is 2500 pixels.”
during upload of images to your WordPress instance you can try the following:

Fix

• Open an FTP client e.g. Filezilla
• connect to your server
• open the wp-config.php file
• add the following line to the file

  • define('WP_MEMORY_LIMIT', '256M');

• save / upload

Explanation

WordPress seems to run only with 32MB memory for its PHP runtime by default.
Increasing the memory limit seems to remedy the issue.