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?
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();
}