bufferedimage

I have a collection of BufferedImage instances, one main image and some subimages created by calling getSubImage on the main image. The subimages do not overlap. I am also making modifications to the subimage and I want to split this into multiple threads, one per subimage. From my understanding of how BufferedImage , Raster and DataBuffer work, this should be safe because: Each instance of BufferedImage (and its respective WritableRaster and SampleModel ) is accessed from only one thread. The shared ColorModel is immutable The DataBuffer has no fields that can be modified (the only thing that

I'm looking for the fastest way to write pixels on javafx.scene.image.Image . Writing to BufferedImage 's backing array is much faster. At least on the test image I made it took only ~20ms for BufferedImage , WritableImage on the other hand took ~100ms. I already tried SwingFXUtils but no luck. Code for BufferedImage (faster): BufferedImage bi = createCompatibleImage( width, height ); WritableRaster raster = bi.getRaster(); DataBufferInt dataBuffer = (DataBufferInt) raster.getDataBuffer(); System.arraycopy( pixels, 0, dataBuffer.getData(), 0, pixels.length ); Code for WritableImage (slower):

I know how to get a BufferedImage from JComponent, but how to get a BufferedImage from a Component in java ? The emphasis here is an object of the "Component" type rather than JComponent. I tried the following method, but it return an all black image, what's wrong with it ? public static BufferedImage Get_Component_Image(Component myComponent,Rectangle region) throws IOException { BufferedImage img = new BufferedImage(myComponent.getWidth(), myComponent.getHeight(), BufferedImage.TYPE_INT_RGB); Graphics g = img.getGraphics(); myComponent.paint(g); g.dispose(); return img; } Component has a

I'm writing a simple scanning application using jfreesane and Apache PDFBox . Here is the scanning 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 making PDF: PDDocument document = new PDDocument(); float width = bimg.getWidth();

Thanks ahead of time for the help Description: The program draws, displays, and saves an image. It works as following: the object itself extends Frame. In the constructor, the object creates a BufferedImage, and calls a method that draw onto that image. Then, it displays the image onto the Frame. Finally, it saves the image into a file (I don't care what format it uses). The main program creates the object, which does the rest. Problem: The saved file always has a colored background! This is especially wierd since the displayed image is fine. If I use "jpg" format with ImageIO.write(), the

There are various ways of reading an image file in java such as BufferedImage and ImageIcon to name a few. I want to know what is the difference between these cases? Are they context dependent that in a particular case only one of them can be used? What would be the best way of reading a image selected by JFileChooser by the user and separating the color channels of an image? Alexis Dufrenoy A good way is to use the different ImageIO.read methods, which return BufferedImage objects. Image is an abstract class, so I think the real question is which subclass is more efficient for your program.

I have this simple code to go through a 24bit color windows bmp file BufferedImage mapa = BMPDecoder.read(new File("maps/map.bmp")); final int xmin = mapa.getMinX(); final int ymin = mapa.getMinY(); final int ymax = ymin + mapa.getHeight(); final int xmax = xmin + mapa.getWidth(); for (int i = xmin;i<xmax;i++) { for (int j = ymin;j<ymax;j++) { int pixel = mapa.getRGB(i, j); if (pixel == 0) { System.out.println("black at "+i+","+j); } } } However, when testing on a completely black image, I get this value at pixel : -16777216 . I was hoping to get a 0x0. How can I test for black pixels (or any

I'm going to use the getRGB method of BufferedImage. I want to check the pixels of an image and see which of them have transparency (in general the pixels I will have that are transparent will be totaly transparent). How can I get it from the int that getRGB returns? chubbsondubs BufferedImage img = .... public boolean isTransparent( int x, int y ) { int pixel = img.getRGB(x,y); if( (pixel>>24) == 0x00 ) { return true; } return false; } Of course img has to be in the correct format TYPE_4BYTE_ABGR or some format that supports alpha channels else if will always be opaque (ie 0xff). the correct

I was looking at the ImageConverter class, trying to figure out how to convert a BufferedImage to 8-bit color, but I have no idea how I would do this. I was also searching around the internet and I could find no simple answer, they were all talking about 8 bit grayscale images. I simply want to convert the colors of an image to 8 bit... nothing else, no resizing no nothing. Does anyone mind telling me how to do this. This code snippet from the article "Transparent gifs in Java" at G-Man's Uber Software Engineering Blog works well: public static void main(String[] args) throws Exception {

I have a scrollpane where load an image. I wont this image with her natural size, and if this image is too big, I wont activated the scrollbar, but this instruction g.drawImage(immagine, 0, 0, getWidth(), getHeight(), this); scaled image for placing in scrollpane. What can I do? Class Gui: import java.awt.*; import java.awt.event.*; import java.io.File; import javax.swing.*; public class Gui implements ActionListener { private JFrame frmEditor; private Mappa content; private JMenuItem mntmSfondo; private JScrollPane scrollabile; /** * Launch the application. */ public static void main(String[]