To adjust the contrast levels, use the same image that you used to adjust the brightness levels. Start by adjusting the contrast all the way up and all the way down, notice how the image changes. At the very top level, the picture will be very bright and details become overemphasized. At the very bottom level, the details in the picture become muddled.
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Adjust the contrast all the way up and then slowly come back down until you can begin to see details (i.e. shadows) in the white areas. At this time, you’ll want to double check your brightness levels and maybe make some adjustments. Make sure your black areas still look black. If they look gray, then you’ll need to go and adjust the brightness again.
