How to get a .tif image with n different colors?

Question

Hi..i want to know how can i get a .tif image colored by some colors. I want to do something like this:
if(tifImage.pixel < 0.1) {
tifImage.pixel = yellow;
else if( 0.1 <= tifImage.pixel && tifImage.pixel <0.5){
tifImage.pixel = red;
up to n colors.
I prove the next code, but it is not getting the colors i want.
public void generateImage(BufferedImage bi,double alto,double medio,String output){
          int width = bi.getWidth(); // Dimensions of the image
          int height = bi.getHeight();
          // Some constant colors (as arrays of integers).
          int[] red = {255, 0, 0};
          int[] green = {  0,255,  0};
          //int[] blue = {  0,  0,255};
          int[] yellow = {255,255, 0};
          //int[] background = { 85, 85, 85};
          int[] background = { 255, 255, 255};
          // The original image data will be stored on this array.
          int[][][] imageData = new int[width][height][3];
          // We'll fill the array with a test pattern bars thingie.
          double[] pixelArray=null;
          for(int w=0;w<width;w++)
               for(int h=0;h<height;h++)
                    if(bi.getRaster().getPixel(w,h,pixelArray)[0]>=9000){
                         //lo dejo blanco
                         imageData[w][h] = background;
                    else if(bi.getRaster().getPixel(w,h,pixelArray)[0]>=alto){
                         //lo dejo rojo
                         imageData[w][h] = red;
                    else if(bi.getRaster().getPixel(w,h,pixelArray)[0]>=medio){
                         //lo dejo amarillo
                         imageData[w][h] = yellow;
                    else{
                         //lo dejo verde
                         imageData[w][h] = green;
          // Now we have a color image in a three-dimensional array, where the
          // third dimension corresponds to the RGB components.
          // Convert the color image to a single array. First we allocate the
          // array.
          // Note that this array will have the pixel values composed on it, i.e.
          // each R,G and B components will yield a single int value.
          byte[] imageDataSingleArray = new byte[width*height*3];
          int count = 0;
          // It is important to have the height/width order here !
          for(int h=0;h<height;h++)
               for(int w=0;w<width;w++)
                    // Rearrange the data in a single array. Note we revert RGB, I still don't
                    // know why.
                    imageDataSingleArray[count+0] = (byte)imageData[w][h][2];
                    imageDataSingleArray[count+1] = (byte)imageData[w][h][1];
                    imageDataSingleArray[count+2] = (byte)imageData[w][h][0];
                    count += 3;
          // Create a Data Buffer from the values on the single image array.
          DataBufferByte dbuffer = new DataBufferByte(imageDataSingleArray,width*height*3);
          // Create an pixel interleaved data sample model.
          SampleModel sampleModel =
               RasterFactory.
               createPixelInterleavedSampleModel(DataBuffer.TYPE_BYTE,
                         width,height,3);
          // Create a compatible ColorModel.
          ColorModel colorModel = PlanarImage.createColorModel(sampleModel);
          // Create a WritableRaster.
          WritableRaster raster = RasterFactory.createWritableRaster(sampleModel,dbuffer,new Point(0,0));
          // Create a TiledImage using the SampleModel.
          TiledImage tiledImage = new TiledImage(0,0,width,height,0,0,sampleModel,colorModel);
          // Set the data of the tiled image to be the raster.
          tiledImage.setData(raster);
          // Save the image on a file.
          JAI.create("filestore",tiledImage,output,"TIFF");
Thanks

Answer 1

I tried that. When I open one image and set the exposure, then go to open the second image, nothing happens. I then saved one image as a psd file, then it would let me open the raw file a second time. When I had both open on the same screen and dragged the layer from one into another image, the layer size ended up being different than the other file. It was shifted down and to the left. I need these images to be pixel locked, and the user experience I went through did not allow me to do this.
I also do not see a way to copy/paste layers between files.