Canon CanoScan D660U Canon Plug-in Module CS-U3.9 User's Guide - Page 45
Brightness and Contrast Settings, Contrast, Brightness
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STEP 3 Brightness and Contrast Settings You can adjust the image with two slide bars, one for contrast and one for brightness. Use this method to adjust an image before scanning if it is slightly out of focus or too dark. Hint • You cannot use this feature with the black and white or color scan modes when ColorSync is selected. Contrast Contrast is the difference between the lightest light and the darkest dark in the image. A high contrast setting creates a great difference between light and dark shades, and there is a very sharp distinction between light and dark areas of the image. A low contrast setting creates a small difference between light and dark shades, and the distinction between light and dark areas of the image are not as obvious. Contrast = 128 (Normal) Contrast = 170 Contrast = 100 If the image appears slightly out of focus, increase the contrast setting to sharpen the image. If the contrast setting is too high, shadows will blacken and the highlights will wash out. Brightness Brightness is the overall lightness or darkness of an image without changing the contrast. Adjust the brightness setting to change the overall lightness or darkness of the entire image. If the brightness setting is too high, the highlights will wash out, and if too low, the shadows will blacken. Brightness = 128 (Normal) Brightness = 190 Brightness = 80 45