Greetings.
I am trying to color correct an old printer while simultaneously prepare images for output both at home for proofs as well as to a service bureau. Have never done this so I need a bit of help. Back in the day, I would include a gray scale and a color scale with the artwork when photographing so that labs could color correct images more accurately. I want to do the same thing but I have no digital gray scales or color scales.
Are these two items available somewhere or will I just have to scan my own?
How do I assure the scanned scales and the output are matched?

Any help with this would be appreciated.