Re: The DataUtility Class

• To: Vimal Gopal <gopal@xxxxxxx>
• Subject: Re: The DataUtility Class
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Wed, 12 Jul 2000 06:51:37 -0500

Hi Vimal,

> It's me again.
> 
> float[][] pixels = new float[rows][cols];
> FlatField image = DataUtility.makeImage(pixels);
> 
> What is pixels?  I tried changing the values of pixels around (8.0, 64.0, 
> 256.0,
> etc), but it never really changed the image I display.  It's
> remains the same green image.  So then, what is pixels, or what am I doing
> wrong?

The pixels array contains the radiance values of pixels in
the image.  If all pixels have the same radiance value, then
your picture will be a constant color.  It is always the same
color because VisAD auto-scales the ranges of ScalarMaps
unless you explicitly call ScalarMap.setRange().

If you create an image with different values for pixel radiances,
and explicitly call setRange(), you'll see something more
interesting.

Cheers,
Bill
----------------------------------------------------------
Bill Hibbard, SSEC, 1225 W. Dayton St., Madison, WI  53706
hibbard@xxxxxxxxxxxxxxxxx  608-263-4427  fax: 608-263-6738
http://www.ssec.wisc.edu/~billh/vis.html

• References:
  • The DataUtility Class
    • From: Vimal Gopal