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Chapter 8 ISIS/TWAIN Driver Settings
[Staple Detection] Check Box
Select this check box to stop feeding when the sensor
detects a folded corner on a document, which occurs when
an attempt is made to feed stapled documents.
[JPEG Transfer] Check Box
When this check box is selected, scanned image data is
always compressed to JPEG format within the scanner for
output to the computer.
Hint
• Scanned image data is output from the scanner as an
uncompressed or JPEG transfer, depending on instructions
from the ISIS/TWAIN driver or application program.
– With uncompressed transfer, scanned image data is output
without being compressed. Therefore, if the image data is
large, transfer of the data from the scanner to the computer
may take a long time.
– JPEG transfer is useful for color and grayscale images, as
scanned image data is JPEG-compressed within the
scanner before it is output.
This reduces the size of the image data for output, so
transfer time from the scanner to the computer is shortened.
• When JPEG Transfer is selected, image data from the
scanner is always output as JPEG-compressed data.
– When the uncompressed saving format is selected in the
application program, JPEG-compressed image data is
reconverted to uncompressed data before it is transferred to
the application. Image quality deteriorates as a result.
– This check box setting is ignored if the application program
requests a JPEG transfer.
– Application program requests depend on the specifications
of the particular program.
Image Compression Ratio
Adjusts the compression ratio of the scanned image data.
Moving the slider towards [High Quality] reduces the
compression ratio and increases the image quality. Moving
towards [High Compression] increases the compression
ratio. Although this reduces the file size, the image quality
is also reduced.
Double Feed Detection
This function stops document transport when double
feeding of document pages is detected, and enables you to
select the detection method to suit the type of documents
to be scanned.
(See “Double-Feed Detection” on p. 4-5.)
[Detect by Length]
This method of double feed detection is useful for batch
scanning of same-size documents. The length of the first
document page fed is measured as a standard, and if a
subsequent document is detected to be 1.38" (35 mm)
longer (or shorter) than the standard, a double feed is
judged to have occurred, and document transport is
stopped.
[Detect by Ultrasonic]
This method of double feed detection is useful for batch
scanning of different-size documents. When the ultrasonic
sensor detects overlapping documents and spacing
between documents, a double feed is judged to have
occurred, and document transport is stopped.
Hint
Both detection methods can be used together.
[Setting] Button
This button is enabled when [Detect by Ultrasonic] is
selected, and displays the [Detect Double Feed Setting]
dialog box.
In the [Detect Double Feed Setting] dialog box, you can
select the sensor position for detection and set a non-
detection area so that the area where a stamp or label is
affixed to the document page is not detected as a double
feed.
