/** Creates the images composing the grid. */
 private void createGridImagesAsTextures() {
   if (parent.getColorModel().equals(ImViewer.GREY_SCALE_MODEL)) {
     if (!hasGridImagesAsTexture()) {
       clearTextureMap(gridImagesAsTextures);
       gridImagesAsTextures = parent.getGridImagesAsTexture();
     }
   } else {
     clearTextureMap(gridImagesAsTextures);
     gridImagesAsTextures = parent.getGridImagesAsTexture();
   }
 }
 /** Creates the images composing the grid. */
 private void createGridImages() {
   // if (combinedImage == null) return;
   if (originalGridImages == null) originalGridImages = new ArrayList<BufferedImage>();
   clearList(gridImages);
   if (ImViewer.GREY_SCALE_MODEL.equals(parent.getColorModel())) {
     createGridImagesForGreyScale();
     return;
   }
   List l = parent.getActiveChannels();
   int maxC = parent.getMaxC();
   switch (l.size()) {
     case 0:
       for (int i = 0; i < maxC; i++) gridImages.add(null);
       break;
     case 1:
     case 2:
     case 3:
       if (isImageMappedRGB(l) && !parent.isCompressed()) {
         combinedImage = null;
         combinedImage = Factory.magnifyImage(gridRatio, renderedImage);
         int w = combinedImage.getWidth();
         int h = combinedImage.getHeight();
         DataBuffer buf = combinedImage.getRaster().getDataBuffer();
         List<ChannelData> list = parent.getSortedChannelData();
         Iterator<ChannelData> i = list.iterator();
         int index;
         while (i.hasNext()) {
           index = i.next().getIndex();
           if (parent.isChannelActive(index)) {
             if (parent.isChannelRed(index)) {
               gridImages.add(
                   Factory.createBandImage(
                       buf, w, h, Factory.RED_MASK, Factory.BLANK_MASK, Factory.BLANK_MASK));
             } else if (parent.isChannelGreen(index)) {
               gridImages.add(
                   Factory.createBandImage(
                       buf, w, h, Factory.BLANK_MASK, Factory.GREEN_MASK, Factory.BLANK_MASK));
             } else if (parent.isChannelBlue(index)) {
               gridImages.add(
                   Factory.createBandImage(
                       buf, w, h, Factory.BLANK_MASK, Factory.BLANK_MASK, Factory.BLUE_MASK));
             }
           } else {
             gridImages.add(null);
           }
         }
       } else {
         retrieveGridImages();
       }
       break;
     default:
       retrieveGridImages();
   }
 }
 /**
  * Returns <code>true</code> if the color model is RGB, <code>false</code> otherwise.
  *
  * @return See above.
  */
 boolean isModelRGB() {
   return !ImViewer.GREY_SCALE_MODEL.equals(parent.getColorModel());
 }