Go through this image to gif converter

Question

Hello!
public class ImageToGifConverter {
     public static void main(String args[]) {
          try{
               System.out.println("starting");
               String file="E:/downloads/animgif/toanimate/4.jpg";
               Frame f=new Frame("myframe");
               Image i1=f.getToolkit().getImage(file);
               Dimension size=getImageDimension(file);
               // get the pixel data of the input image
               int[][] snagedData=getPixels(i1,(int)size.getWidth(),(int)size.getHeight());
               // quantize it to 256 color
               int[] palette=Quantize.quantizeImage(snagedData,256);
               int[] tempImgData=getFilteredPixels(palette,snagedData);
               // get the 256 color image
               Image tempImage=f.createImage(new MemoryImageSource((int)size.getWidth(), (int)size.getHeight(), tempImgData, 0,(int)size.getWidth()));
               FileOutputStream fos=new FileOutputStream("e:/downloads/animgif/toanimate/new5.gif");
               GifEncoder acmeGe=new GifEncoder(tempImage,fos,false);
               acmeGe.encode();
               fos.close();
//               WriteGIF.toFile(i1,"e:/downloads/animgif/toanimate/new1.gif");
               System.out.println("Encoded Successfully");
          }catch(Exception e) {
               e.printStackTrace();
     private static int[][] getPixels(Image image,int w,int h) throws IOException {
          image.flush();
          image.getWidth(null);
          image.getHeight(null);
int pix[] = new int[w * h];
PixelGrabber grabber = new PixelGrabber(image, 0, 0, w, h, pix, 0, w);
try {
if (grabber.grabPixels() != true) {
throw new IOException("Grabber returned false: " +
grabber.status());
} catch (InterruptedException e) {
e.printStackTrace();
int pixels[][] = new int[w][h];
for (int x = w; x-- > 0; ) {
for (int y = h; y-- > 0;) {
pixels[x][y] = pix[y * w + x];
     return pixels;
     private static int[] getFilteredPixels(int palette[], int pixels[][]) {
int w = pixels.length;
int h = pixels[0].length;
int pix[] = new int[w * h];
// convert to RGB
for (int x = w; x-- > 0; ) {
for (int y = h; y-- > 0; ) {
pix[y * w + x] = palette[pixels[x][y]];
return pix;
// just to get the image size is there anyother way? becos image.getHeight(null)returns -1
     private static Dimension getImageDimension(String file) throws IOException {
          FileSeekableStream stream=new FileSeekableStream(file);
          RenderedOp srcImage = JAI.create("stream", stream);
          Dimension d=new Dimension(srcImage.getWidth(),srcImage.getHeight());
          stream.close();
          srcImage.dispose();
          return d;
am using http://www.gurge.com/amd/java/quantize/src/Quantize.java for quantization. also am using Acme.JPM.Encoders.GifEncoder for gifencoding
It ignores certain colors(replace it with black or grey) while converting to gif and some o/p images look akward.I cant get whats wrong .Any tips or suggestions
It will be great if I get a good comment
Thanks in advance

Answer 1

You could use ImageObserver for the width and height. They are -1 until the image is fully loaded. With ImageObserver your app will be notified when the dimensions are ready.