Plustek Opticpro A320E Flatbed Scanner - Manual (Page 48)

The TWAIN Interface 13
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· 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.
2.2.1.7 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 the arrow signs on the right and left ends.
The current value is shown to right of each scroll bar.
2.2.1.8 Contrast
The higher the contrast, the sharper the image. The lower the contrast, the
more blurry an image will be.
You may adjust the contrast either way:
· Slide the thumb of the scroll bar to the right or left, which raises or lowers
the differences between light and dark colors in your image.
· Click the arrow signs on the right and left ends.
The current value is shown to right of each scroll bar.
2.2.1.9 Page Settings
Auto Crop
Clicking this Auto Crop box will have the TWAIN program identify the
dimensions of the image you scanned and crop around the edges. The crop
shape will be a square or rectangle, in that it will not hug the edges of oddly-
shaped images. This command can be useful when scanning smaller images