Plustek Opticpro A320E Flatbed Scanner - Manual (Page 213)

Button Configuration Window Overview 41
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Document to be scanned Resolution (dpi)
Text (for printing) 300
Text (for faxing) 200
Text (for OCR) 300
Black and white or gray image 150
Color image or photo 100
· These values are only recommendations and should be raised if the
resulting image is rough or you need to view fine details.
· To scan a large-size color image with a higher resolution (usually over
600 dpi) increases scan time and file size substantially and requires
huge system resources. Therefore, a higher resolution for color
scanning is recommended only when you scan a small area.
Brightness
Raising the brightness increases the amount of white in an image, making it
appear more washed out. Lowering the brightness may help you read light or faint
text.
You may adjust the brightness either way:
· Slide the thumb of the scroll bar to the right or left, which adds lightness or
darkness to all colors in your image.
· Click on the scroll bar.
The current value is shown to right of each scroll bar.
Contrast
The higher the contrast, the sharper the image. The lower the contrast, the more
blurry an image will be.