fill out bulletins

[jak]

Hello everyone,
I would like to write a tool to compile post office bulletins because
here, unfortunately, they are still the most convenient way to interface
the public administration. I don't want to create a UI to edit the
bulletin, I will take the data from some file or database but I'd like
to print or save the bulletin to the file with all the fields filled in.
To accomplish this, I thought about creating a basic graphic (jpg?) file
with the bulletin image, filling in the fields and then saving it in a
new file.
Can you direct me to a better way? And also, direct me to a library that 
allows me to accomplish this easily?

Thank you in advance.