My Dad collected movie posters from the theater. Here's one.

[usonian]

7. The posters were well-preserved.

I just snapped these two with an iPhoneSE3 (no need to open the camera bags) and did my usual very minimal processing with the mac Preview app.

For these old prints, I took the color up a little (I hate garish color) just enough to convey what the artist intended.

I would take out the dust and dirt spots with the free GIMP program.