I am writing a simple scanning application using jfreesane and Apache PDFBox .
Here is the scan code:
InetAddress address = InetAddress.getByName("192.168.0.17"); SaneSession session = SaneSession.withRemoteSane(address); List<SaneDevice> devices = session.listDevices(); SaneDevice device = devices.get(0); device.open(); device.getOption("resolution").setIntegerValue(300); BufferedImage bimg = device.acquireImage(); File file = new File("test_scan.png"); ImageIO.write(bimg, "png", file); device.close();
And creating a PDF:
PDDocument document = new PDDocument(); float width = bimg.getWidth(); float height = bimg.getHeight(); PDPage page = new PDPage(new PDRectangle(width, height)); document.addPage(page); PDImageXObject pdimg = LosslessFactory.createFromImage(document, bimg); PDPageContentStream stream = new PDPageContentStream(document, page, PDPageContentStream.AppendMode.APPEND, true); stream.drawImage(pdimg, 0, 0); stream.close(); document.save(filename); document.close();
And here is the result:
As you can see, the PDF image is more “pale” (saturation? - Sorry, I am not good at color theory and don’t know how to name it correctly).
What I learned:
- Printing a BufferedImage in JLabel using the JLabel (new ImageIcon (bimg)) constructor gives the same result as in the PDF format (“faded” colors) so I think the PDFBox is not the reason.
- Changing scan resolution - no effect.
- bimg.getTransparency () returns 1 (OPAQUE)
- bimg.getType () returns 0 (TYPE_CUSTOM)
PNG file:
http://s000.tinyupload.com/index.php?file_id=95648202713651192395
Pdf file
http://s000.tinyupload.com/index.php?file_id=90369236997064329368
source share