Plustek Opticpro A320E Flatbed Scanner - Manual (Page 49)

TWAIN Help 14
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such as photographs.
However, if you manually adjust the scan frame, the Auto Crop will be
automatically cancelled.
Multi-Crop (This function may or may not be available depending on the
scanner model you purchase.)
When you scan two or more small items at the same time using the flatbed
scanner, you may tick this check box to perform multi-crop automatically. The
program will identify each individual item and generate separate scanned image
files. The scanned items must be placed separately and no two items are
sticking together on the scanner glass.
Place all small items on the scanner's
flatbed with a slight gap between them for best scanning results .
Auto Deskew
If this box is ticked, the TWAIN program will automatically straighten the
skewed image after auto crop is done.
However, if you manually adjust the scan frame, the auto crop is cancelled and
therefore the image will not be auto deskewed.
If the placed image is too slanted (>10º), the Auto Deskew
function will not recognize the skewed image(s).
Auto Rotate
Tick the check box of Auto Rotate , the document image you scanned will be
automatically rotated and straightened.
Auto Density
Checking this box automatically adjusts the Histogram , to make the scanned
image clearer. It does this by increasing the difference between color tones.
Auto Density defines the lightest and darkest pixels in each channel as white
and black and then redistributes the intermediate pixel values proportionately.
In general, the Auto Density feature gives good results when a simple contrast
adjustment is needed to enhance an image with an average distribution of pixel
values; however, this feature does not provide the more precise control that can
be achieved by adjusting the Histogram controls manually.
Page Settings area, located at the lower part of the Main Settings tab, displays
the current settings for image orientation and photo negative effect.