So I'm preparing my halloween costume. I took higher resolution screenshots and need to print them and paste on a bristol board. Anyway, I brought it to Staples and asked them to size it but they said they don't offer that service anymore. They said to download free trial Photoshop resize and save the pictures on photoshop, and they'd be able to print it. So I ask for help here because I've never used PS. I've downloaded it but have no idea how to do any of this.
Can somebody inform me how to: take my existing pictures, create a hypothetical 20" x 30" bristol board in photoshop, resize the pictures on this hypothetical bristol board, and once decided upon a specific size, save the multiple individual pictures as jpg's? This thing is frustrating the heck outta me.
