What does gamma mean on my printer settings? -

I have an Epson all in one. And it scans a document, then saves it under gamma-(some #s) and if i print black and white it says gamma 22? what does gamma mean for the printer?

It s a color setting. Some printers use it for calibrations. I m not sure exactly how it pertains to your situation. Most of the time it is use for color matching.