Can't be a driver issue if you are using the same driver as the Win 7 PC.
Assuming the GPD with PS and not that you are comparing the PCL vs PS GPD, because that will definitley get different output.
Beyond that would likely be App settings, like in Acrobat/Reader where you have "Let Printer determine color" that will also change the output.
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for posts that resolve your issues. Your feedback counts!Joe Arseneau