Convert each animated GIF frame to a separate BufferedImage

Question

I want to be able to take an animated GIF as input, count the frames (and perhaps other metadata), and convert each to a BufferedImage. How can I do this?

Answer 1

If you want all the frames to be the same size (for optimized GIFs) try something like this:

try {     String[] imageatt = new String[]{             "imageLeftPosition",             "imageTopPosition",             "imageWidth",             "imageHeight"     };          ImageReader reader = (ImageReader)ImageIO.getImageReadersByFormatName("gif").next();     ImageInputStream ciis = ImageIO.createImageInputStream(new File("house2.gif"));     reader.setInput(ciis, false);      int noi = reader.getNumImages(true);     BufferedImage master = null;      for (int i = 0; i < noi; i++) {          BufferedImage image = reader.read(i);         IIOMetadata metadata = reader.getImageMetadata(i);          Node tree = metadata.getAsTree("javax_imageio_gif_image_1.0");         NodeList children = tree.getChildNodes();          for (int j = 0; j < children.getLength(); j++) {             Node nodeItem = children.item(j);              if(nodeItem.getNodeName().equals("ImageDescriptor")){                 Map<String, Integer> imageAttr = new HashMap<String, Integer>();                  for (int k = 0; k < imageatt.length; k++) {                     NamedNodeMap attr = nodeItem.getAttributes();                     Node attnode = attr.getNamedItem(imageatt[k]);                     imageAttr.put(imageatt[k], Integer.valueOf(attnode.getNodeValue()));                 }                 if(i==0){                     master = new BufferedImage(imageAttr.get("imageWidth"), imageAttr.get("imageHeight"), BufferedImage.TYPE_INT_ARGB);                 }                 master.getGraphics().drawImage(image, imageAttr.get("imageLeftPosition"), imageAttr.get("imageTopPosition"), null);             }         }         ImageIO.write(master, "GIF", new File( i + ".gif"));      } } catch (IOException e) {     e.printStackTrace(); }