WindowLevel Method

RasterImageExamples.prototype.WindowLevelExample = function ( )
{
   Tools.SetLicense ( ) ;

   with (Leadtools) {
      with (Leadtools.Codecs) {
         with (Leadtools.ImageProcessing.Core) {

            var codecs = new RasterCodecs();
            // Load an image that has BottomLeft ViewPerspective
            var srcFileName = "Assets\\Image1.cmp";
            var image;
            return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
               return codecs.loadAsync(LeadStreamFactory.create(loadFile))
            })
               .then(function (img) {
                  image = img;

                  // Change the image to 16-bit grayscale 
                  var grayscaleCmd = new Leadtools.ImageProcessing.GrayscaleCommand(16);
                  grayscaleCmd.run(image);

                  var minMaxBitsCmd = new MinMaxBitsCommand();
                  minMaxBitsCmd.run(image);

                  var minMaxValuesCmd = new MinMaxValuesCommand();
                  minMaxValuesCmd.run(image);

                  var lowBit = minMaxBitsCmd.minimumBit;
                  var highBit = minMaxBitsCmd.maximumBit;

                  var size = (1 << (image.highBit - image.lowBit + 1));

                  var palette = new Array(size);

                  // fill the first half of the LUT with RED
                  for (var x = 0; x < size / 2; x++) {
                     var color = [];
                     color.a = 255;
                     color.r = 255;
                     color.g = 0;
                     color.b = 0;
                     color.reserved = 0;
                     palette[x] = color;
                  }

                  var minVal = minMaxValuesCmd.minimumValue;
                  var maxVal = minMaxValuesCmd.maximumValue;

                  // Fill the rest with gray values 
                  for (var x = (size / 2) ; x < size; x++) {
                     var color = [];
                     color.a = 255;
                     color.r = Math.floor(Math.max(0, Math.min(255, ((x - minVal) * 255 / (maxVal - minVal)))));
                     color.g = color.r;
                     color.b = color.r;
                     color.reserved = 0;
                     palette[x] = color;
                  }
                  image.windowLevel(lowBit, highBit, palette, RasterWindowLevelMode.paintAndProcessing);

                  return Tools.AppLocalFolder().createFileAsync("IMAGE1_WindowLevel.BMP")
               })
                  .then(function (saveFile) {
                     var saveStream = LeadStreamFactory.create(saveFile);
                     return codecs.saveAsync(image, saveStream, RasterImageFormat.bmp, 0)
                  })
                  .then(function () {

                     image.close();
                     codecs.close();
                  });
         }
      }
   }
}