Installation can be done easily through npm, ssh into your pi and run hte following command:
npm install -g image-sequencer
You must have node.js and npm installed on the pi which can be downloaded here.
Image-sequencer has a full featured cli and images can be processed right from the terminal. The cli is also chainable so commands can be chained together like:
command to click pictures && sequencer -s "step1 step2"
The processed images after each step are saved in the ./output folder. You can read the complete cli guide in the documentation.
Pictures can be fed to the pi or can be clicked locally through hardware like piCam. Images can be simply processed and saved by chaining the script to click pictures with the command to run sequencer.