| Image File Types and Associated Attributes |
The table Device Attributes for TWAIN Scanners describes
the attributes that are supported under Windows NT, Windows 2000, and Windows
XP operating systems for TWAIN scanners. You must specify DEVICE=SCANNER.
For example:
rc=imgop(taskid,'READ','twain','device=scanner dpi=100');
Device Attributes for TWAIN Scanners
|
Attribute |
Description |
Default |
BRIGHT=n
|
sets the brightness setting. |
0 |
CONTRAST=n
|
sets the contrast setting. This option is ignored with
bi-tonal images. |
0 |
DPI=n
|
sets the number of dots per inch. |
200 |
|
FEEDER | NOFEEDER |
specifies how the document is scanned. FEEDER assumes
that there is a document feeder and produces an error if there is no document
feeder. NOFEEDER scans from the bed and ignores the feeder if one is attached. |
Use the feeder if it is attached; otherwise, use the scan from the bed. |
|
SELSRC |
displays the TWAIN Select Source window. The default source is highlighted,
but you can select a different source. If you do not specify SELSRC, then
the application uses the default source. |
|
|
SETCAP |
displays the data source's capability window. |
|
|
SCNAME=product |
sets the default source. Specify the product name (as displayed in the
TWAIN Select Source window) of the scanner. (This product name may not be
the same as the name of the scanner.) If product
matches more than one scanner's product name, then the first match is selected.
If you do not specify SCNAME, then the source defaults either to the
last source used or to the first source in the list (if the application has
not been run yet). |
|
|
TYPE=type |
sets the type of image to generate. You can specify
BITONAL, RGB, or GRAY. |
For TWAIN scanners, the highest resolution (bits/pixel) that is supported
by the device. |
|
UNITS=units |
sets the size units for the SIZE and START options.
You can specify IN, CM, MM, or PIXEL. |
IN |
|
XDPI=n |
sets the dots per inch for the width only. |
200 |
|
XSIZE=d |
sets the width to scan (decimal value). |
8.5 inches |
|
XSTART=d |
sets the starting point of the scan along the width. |
0 |
YDPI=n
|
sets the dots per inch for the height only. |
200 |
|
YSIZE=d |
sets the height to scan (decimal value). |
11 inches |
|
YSTART=d |
sets the starting point of the scan along the height. |
0 |
 |
|
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