Specifically I want to make a collage of many pictures. For that purpose the software should be able to handle many large pictures, and align them relative to each other (snap center to center, etc)
I’d like to avoid having to do it in libre office if at all possible.
Is there anything like that?
I would probably use Inkscape or Krita.
I made some posters in krita for work. Worked okay. Just make sure you start with the good ratio in px for printing.