Random collection of useful things you can do with images
pictool is a command line program for manipulating and altering images.
For running pictool, opencv and gexiv2 need to be installed. Usually, both are included in different distributions (like openSUSE or Debian) and can be installed via the available package manager (like zypper or apt).
When the requirements are installed, you can install pictool via pip:
pip install pictool
Download the file for your platform. If you're not sure which to choose, learn more about installing packages.