BGR bytes to Image

Question

I have loads of data, in the form of a byte array in one long list of BGRBGRBGR values. There is a bufferedImage type BGR byte:
BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_3BYTE_BGR);
but how can i write my values into it? I tried getting a WritableRaster, but the arguments for that are int int int int[]
raster.setPixels(int startx, int starty, int width, int height, int[] pixels)
(which I havnt had any luck with iether, all my integer pixles are black..)
So far, Ive been trying to use int pixel values to just get something working:
public static Image getImageFromArray(int[] pixels, int width, int height) {
        BufferedImage image = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
        //image.
        int pix[] = new int[width*height*3];
        for (int i = 0 ; i < width*height ; i +=3){
             //pix=Color.BLUE.getRGB();
     pix[i]=255;
     pix[i+1]=0;
     pix[i+2]=0;
WritableRaster raster = (WritableRaster) image.getData();
raster.setPixels(0,0,width,height,pix);
return image;
}but its all black (oh, and i thought the int values contained the RBG (so i would use Color.BLUE>getRGB();) but the setPixels gets an arrayindex out of bounds for anything less than 3*width*height, suggesting its in int rgb format...
Edited by: IJustWantToSayHelloWorld on Aug 13, 2010 8:59 AM                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                               

Answer 1

This method would wrap your byte[] array into a BufferedImage.
/**Wraps a BGRBGR... byte array into a TYPE_3BYTE_BGR BufferedImage*/
public static BufferedImage wrapInImage(byte[] imgData, int w, int h) {
    DataBuffer db = new DataBufferByte(imgData,w * h * 3);
    WritableRaster raster = WritableRaster.createInterleavedRaster(
            db,w,h,w*3, 3, new int[]{2,1,0}, null);
    ColorModel colorModel = new ComponentColorModel(
                    ColorSpace.getInstance(ColorSpace.CS_sRGB),
                    new int[]{8,8,8}, false, false,
                    Transparency.OPAQUE,
                    DataBuffer.TYPE_BYTE);
    return new BufferedImage(colorModel, raster,false, null);
}Because you create the image from your own byte array, the image is guaranteed not be hardware accelerated. Graphical operations to or from the image may not be as fast as they can.
This method would create a new image (may be hardware accelerated), at the cost of memory and performance in creating the image.
/**Creates a new TYPE_3BYTE_BGR BufferedImage from a BGRBGR... byte array.*/
public static BufferedImage createImage(byte[] imgData, int w, int h) {
    DataBuffer db = new DataBufferByte(imgData,w * h * 3);
    WritableRaster srcRast = WritableRaster.createInterleavedRaster(
            db,w,h,w*3, 3, new int[]{2,1,0}, null);
    BufferedImage copy = new BufferedImage(w,h,BufferedImage.TYPE_3BYTE_BGR);
    //can be done several ways including row by row (which is not done here)
    copy.getRaster().setDataElements(0,0,srcRast);
    return copy;
}