Source Comix Homepage.
Usually, comic books are provided in two forms, either as images (JPGs mostly), or in archives that contain the same type of files. It doesn't really matter which format they arrive in because Comix should be able to read them all. In any case, you just hit load and select that archive. The contents should be displayed on the left side and each page on the right side.
To install Comix just run the following commands via your systems Terminal.
sudo apt-get install unrar
sudo apt-get install p7zip-full p7zip-rar
sudo apt-get install comix
That's All Enjoy!