Animated GIF Writer

This class will generate an animated GIF from a sequence of individual images. The class provides the following methods:

class GifSequenceWriter {
    public GifSequenceWriter(
        ImageOutputStream outputStream,
        int imageType,
        int timeBetweenFramesMS,
        boolean loopContinuously);

    public void writeToSequence(RenderedImage img);

    public void close();

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As an example, here is how to combine a number of image files into one animated gif (I ran it on these, and got this as a result):

public static void main(String[] args) throws Exception {
  if (args.length > 1) {
    // grab the output image type from the first image in the sequence
    BufferedImage firstImage = File(args[0]));

    // create a new BufferedOutputStream with the last argument
    ImageOutputStream output = 
      new FileImageOutputStream(new File(args[args.length - 1]));

    // create a gif sequence with the type of the first image, 1 second
    // between frames, which loops continuously
    GifSequenceWriter writer = 
      new GifSequenceWriter(output, firstImage.getType(), 1, false);

    // write out the first image to our sequence...
    for(int i=1; i<args.length-1; i++) {
      BufferedImage nextImage = File(args[i]));

  } else {
      "Usage: java GifSequenceWriter [list of gif files] [output file]");

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