Contrast and brightness adjustment

I am pleased to be with you. I hope you can give me the help I'm looking for cold Chicago.

I have an Aspire 5600U all-in-one computer running 64-bit Windows 8 and I would like to adjust contrast and brightness. I found the buttons on the side right that apparently allow me to do it, but I can't understand how to use them. There is no reference to them in the user manual. The screen is beautiful but too contrasty for photo work and I would like to temper a bit to more closely matching prints.

Thank you. I ' lll discover your suggestions.

Tags: Acer

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