TWAIN Scanning Guide Image Enhancements
36 User’s Guide
• Light colored carbon copy paper, such as yellow or pale pink or pale green, with light text -
45% to 55%
•Newspaper or magazine pages - 55% to 70%
• Book pages - 55% to 80%
• Pictures taken inside or in the shade - 60% to 85%
Brightness works in conjunction with Contrast for image enhancement. When you are adjusting
the brightness level to improve the scanned image quality, try adjusting the contrast level as well.
The contrast level is the range between the lightest and darkest parts of the image. For example, if
you scanned a document with notes written in pencil, you may have to decrease the brightness
level to get the handwritten notes to appear in the scanned image. However, when decreasing the
brightness, white starts to appear gray in the image. In that case, raise the contrast level to make
the differences between the lightest and darkest part of the image more defined.
Color image brightness examples
The examples below show the original image at the default setting of 50% brightness level, 25%
brightness and 75% brightness. Adjusting the brightness level does not make the image
completely black nor completely white.
Technical note:
Most monitors have a brightness setting that is user adjustable. When viewing scanned images
on-screen, versus printing the image, the brightness setting of the monitor may effect how light or
dark the scanned image looks when compared to the original. If the scanned image is too
different from the original image, or if adjusting the scanned brightness level does not modify the
image how you want, try adjusting the monitor's brightness level. Refer to the monitor's user
guide for adjusting the brightness level and see if the manufacturer has any recommended
settings.
Black background scanners:
Some scanners have a black background plate. A black background results in more precise
cropping results and skew detection. However, when scanning thin paper, such as multipart color
forms or ruled writing paper, which are less than 18lb paper weight, the background may “bleed”
through into the final image and make the image darker than it should be. In that case, try
adjusting the brightness level between 60% and 80%.
Brightness: 25% Brightness: 50% Brightness: 75%
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