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I’m developing a java applet that must retrieve an image from a scanner. I’m using the JTwain libraries to connect to my scanning device and acquire the image. The only problem is that the scanner retrieves the entire scanning area, while all I want is just a subset of that (a frame), exaclty the top-left corer (in px, width=210, height=237). User Interface is disabled. This is a piece of code:
…
selectedSource.open();
selectedSource.setUnits(JTwainConstants.TWUN_PIXELS);
selectedSource.setXResolution(200.0);
selectedSource.setYResolution(200.0);
selectedSource.setUIEnabled(false);
ValueContainerOneValue valuePixelType = new ValueContainerOneValue();
valuePixelType.setItem(new ItemTypeInteger(Source.TWTY_UINT16, JTwainConstants.TWPT_RGB));
selectedSource.setCapability(Source.ICAP_PIXELTYPE, valuePixelType);
acquiredImage = selectedSource.acquireImage();
selectedSource.close();
…How can I handle that?
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Honda Rc171I am not familiar with JTwain, but I know API of the Morena – Image Acquisition Framework for Java™ Platform. It has
setFrame(double left, double top, double right, double bottom) method. Your described communication in Morena API is as follows:…
source.setUnits(TwainConstants.TWUN_PIXELS);
source.setXResolution(200);
source.setYResolution(200);
source.setPixelType(TwainConstants.TWPT_RGB);
source.setFrame(0,0,210,237);
image=Toolkit.getDefaultToolkit().createImage(source);