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Regarding to “One touch scanning”, you can see the online solution developed especially for that purpose:
You can find more information here:
Regarding to PDF:
Morena – Image Acquisition Framework for Java delivers scanned data via standard Java ImageProducer interface. So the task is: “How to save acquired data to the PDF file format, if the they are produced via ImageProducer interface?” It is the same task as if you produce image data from the image file. According the PDF file format, we have a feedback from our customers, that they have good experiences with iText, a free library for generating PDF files.
Here is a snapshot demonstrating how to save to pdf file using iText library:
TwainSource source = TwainManager.selectSource(null);
MorenaImage morenaImage = new MorenaImage(source);
com.lowagie.text.Image iTextImage=com.lowagie.text.Image.getInstance(image, null);
Document document=new Document(iTextImage);
But, you can use your preferable PDF libraries.
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