WindowLevelExt Method

RasterImageExamples.prototype.WindowLevelExtExample = function () {
   Tools.SetLicense();
   with (Leadtools) {
      with (Leadtools.Codecs) {
         with (Leadtools.ImageProcessing.Core) {


            var codecs = new RasterCodecs();
            // Load a 16-bit grayscale image
            var srcFileName = "Assets\\IMAGE2.DCM";
            var image;
            return Tools.AppInstallFolder().getFileAsync(srcFileName).then(function (loadFile) {
               return codecs.loadAsync(LeadStreamFactory.create(loadFile))
            })
                  .then(function (img) {
                     image = img;
                     // Get the min and max values
                     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 = RasterColor16Helper.maximumComponent;
                        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(RasterColor16Helper.maximumComponent, Tools.ToUInt32(x - minVal) * RasterColor16Helper.maximumComponent / (maxVal - minVal)))));
                        color.g = color.r;
                        color.b = color.r;
                        color.reserved = 0;

                        palette[x] = color;
                     }
                     mage.windowLevelExt(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();
                  });
         }
      }
   }
}