It had to happen, didn't it? I accused Photoshop...well of so many things and if the main one was fixed--ie some decent instructions, I wouldn't have to apologize later. Remember (this is not a test, you will not be graded on this) when I said there should be a way to change the color in certain sections?
There is. It's based on Adobe Logic, tho. But simple! You have to hand it to them, once you spend a couple months looking, it turns out to be a snap. Be on a new layer. You select with that quick selection tool. Then make sure the color you want is the foreground color. Go to edit>fill. Click. Done.
Obviously this is an old poster, stained and discolored. I didn't spent vast amounts of time tweaking. I'm going to use the image below for a vid I'm thinking of so I had to get rid of the text so I could put my own in. It'll be visible for under 5 seconds so I don't think it requires the Vermeer treatment. Perfect for my purpose.