This example demonstrates how to convert a byte array of pixel values that are indices to a color table into a BufferedImage. In particular, the example generates the Mandelbrot set in a byte buffer and combines this data with a SampleModel, ColorModel, and Raster into a BufferedImage. A 16-color index color model is used to represent the pixel colors.

    import java.awt.*;

    import java.awt.event.*;

    import java.awt.geom.*;

    import java.awt.image.*;

    // Instantiate this class and then use the draw() method to draw the

    // generated on the graphics context.

    public class Mandelbrot2 {

        // Holds the generated image

        Image image;

        // 16-color model; this method is defined in

        // e660 用一组像素创建图像

        ColorModel colorModel = generateColorModel();

        public Mandelbrot2(int width, int height) {

            // Initialize with default location

            this(width, height, new Rectangle2D.Float(-2.0f, -1.2f, 3.2f, 2.4f));

        }

        public Mandelbrot2(int width, int height, Rectangle2D.Float loc) {

            // Generate the pixel data; this method is defined in

            // e660 用一组像素创建图像

            byte[] pixels = generatePixels(width, height, loc);

            // Create a data buffer using the byte buffer of pixel data.

            // The pixel data is not copied; the data buffer uses the byte buffer array.

            DataBuffer dbuf = new DataBufferByte(pixels, width*height, 0);

            // The number of banks should be 1

            int numBanks = dbuf.getNumBanks(); // 1

            // Prepare a sample model that specifies a storage 4-bits of

            // pixel datavd in an 8-bit data element

            int bitMasks[] = new int[]{(byte)0xf};

            SampleModel sampleModel = new SinglePixelPackedSampleModel(

                DataBuffer.TYPE_BYTE, width, height, bitMasks);

            // Create a raster using the sample model and data buffer

            WritableRaster raster = Raster.createWritableRaster(sampleModel, dbuf, null);

            // Combine the color model and raster into a buffered image

            image = new BufferedImage(colorModel, raster, false, null);//new java.util.Hashtable());

        }

        public void draw(Graphics g, int x, int y) {

            g.drawImage(image, x, y, null);

        }

    }

Here's some code that uses the Mandelbrot2 class:

    class RunMandelbrot2 {

        static public void main(String[] args) {

            new RunMandelbrot2();

        }

        RunMandelbrot2() {

            Frame frame = new Frame("Mandelbrot2 Set");

            frame.add(new MyCanvas());

            frame.setSize(300, 200) ;

            frame.setVisible(true);

        }

        class MyCanvas extends Canvas {

            Mandelbrot2 mandelbrot;

            MyCanvas() {

                // Add a listener for resize events

                addComponentListener(new ComponentAdapter() {

                    // This method is called when the component's size changes

                    public void componentResized(ComponentEvent evt) {

                        Component c = (Component)evt.getSource();

                        // Get new size

                        Dimension newSize = c.getSize();

                        // Regenerate the image

                        mandelbrot = new Mandelbrot2(newSize.width, newSize.height);

                        c.repaint();

                    }

                });

            }

            public void paint(Graphics g) {

                if (mandelbrot != null) {

                    mandelbrot.draw(g, 0, 0);

                }

            }

        }

    }

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