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There were 4 questions found for your query:

We are planning to scan text, photo, and mixed paper. What is the format for saving each type, and what do you suggest to get the best image quality?
Common uses are TIFF G4 for bitonal images and JPEG for color images with a JPEG quality setting of 80 or more.
When we try to do simplex scanning in our application (set scan_parms.duplex = 0), the software ignores the setting and scans duplex. What's the problem?
It appears the Twain Driver is ignoring the setting our toolkit is providing. You may have to open the Scanner Settings Control Panel and adjust this manually which would affect all scan sessions...
Is it possible to append a new scanned page to an existing multi-page scan file (TIFF) using VisImage for PowerBuider?
Yes, but make sure that you call fu_set_multipage_export with a value of 1, so that the image will be appended at the end of the file. Then call fu_save_image passing in the T...
We need to remove blank pages that are scanned when the scanner is in duplex mode. Also, all the files we scan are multi-page. How do I do this using the functions in VisImage for PowerBuilder?
We have a morphological API in our C/C++ toolkit that is not published in our Power Builder toolkit. Since VisImage for Power Builder uses the DLL, you can create an External API call to the function ...