Yeah, you’ll be able to use the actual scan later for all those screenshots which will look a lot better.
A guy on DeviantArt made some high-res textless versions of the posters.
https://phetvanburton.deviantart.com/art/A-New-Hope-Hi-Res-Textless-Poster-380226123
https://phetvanburton.deviantart.com/art/The-Empire-Strikes-Back-Hi-Res-Textless-Poster-380226583
https://phetvanburton.deviantart.com/art/Return-Of-The-Jedi-Hi-Res-Textless-Poster-380227046