Newbee help for dicom image window center/width manipultation

Question

We have a flash based dicom viewer and i have the folowing code in action script which i want to replace with pixel bender code. is it possible ?
var img_bmp:BitmapData = new BitmapData(Cols, Rows,false,0);
for (var y:Number = 0; y <Rows; y++) {
for (var x:Number = 0; x <Cols; x++) {
gray =  byteArray.readUnsignedShort()*Slope + Intercept;
gray = 255 * gray/WindowWidth  -  Min * 255 / WindowWidth;
gray = uint(gray);
var r:int = gray;
var g:int = gray;
var blue:int = gray;
var c:uint = (r << 16) | (g << 8) | blue;
    img_bmp.setPixel(x, y, c);
Where byteArray is a unsignedshort  sequnce. Slope, intercept, WindowWidth and Min are constants.
From the little i understood of the kernel programming the expected input channel cannot be 2 channel or single channel input.
can any one suggest how i can proceed or give me pointers or for this kind of image manipulation pixel bender is not suitable.
Thanks in advance
Sastradhar

Answer 1

i wrote the below kernel code and compiled using pbutil and it did compile i am having trouble determining the shader width and height.  can some one help me out.
<languageVersion: 1.0;>
kernel pixel
<   namespace : "TMP";
     vendor : "TMP";
     version : 1;
>
         input image1 src;
         output pixel3 dst;
         parameter float Intercept;
         parameter float Slope;
         parameter float WindowWidth;
         parameter float Min;
          void
           evaluatePixel()
        float gray = sample(src, outCoord())*Slope + Intercept ;
              gray =  255.0 * gray/WindowWidth  -  Min * 255.0 / WindowWidth;
              dst = pixel3(gray,gray,gray);
can some one tell me how to get the shader width and height so so that pixel bender can only act on 16 bits or did i get the whole thing wrong.
shader.data.src.input = byteArray;
  shader.data.Slope = Slope;
  shader.data.Intercept = Intercept;
  shader.data.Min = Min;
  shader.data.WindowWidth = WindowWidth;
  shader.data.src.width = Cols >> 1;
  shader.data.src.height = Rows ;
  var myJob:ShaderJob = new ShaderJob(shader, img_bmp,Cols, Rows);
  myJob.addEventListener(ShaderEvent.COMPLETE, pixelComplete);
  myJob.start();
Thanks in advance