How can I get a pixel value from tiff image?

Fri Jun 3 13:04:53 PDT 2005

Hi All,
I have a raster tiff image. After displaying it under Mapserver I want
to display each pixel value that I need. Also I don't want to use
MapScript language such as PHP. So far I can query something such as
map coordinates by using  [mapx] and [mapy] in my query template file
but I don't know How I can query pixel value. Some body who knows
please tell me how?  Here is my query template file :

<html>
<head>
  <title> Query Results </title>
</head>
<body>
    <table class="centered" border="1">
       <tr>
          <th>Bounding box</th>
          <td>[minx],[miny],[maxx],[maxy]</td>
       </tr>
       <tr>
          <th>Image Coordinates</th>
          <td>[img.x], [img.y]</td>
       </tr>
       <tr>
          <th>Map Coordinates</th>
          <td>[mapx], [mapy]</td>
       </tr>
       <tr>
          <th>Number of results</th>
          <td>[nr]</td>
       </tr>
       <tr>
          <th>Scale</th>
          <td>[scale]</td>
       </tr>
       <tr>
          <th>Cellsize</th>
          <td>[cellsize]</td>
       </tr>
  </table>
  <hr/>
</body>
</html>

Farid