Re: ColorControls and images

• To: Bill Hibbard <billh@xxxxxxxxxxxxx>,
• Subject: Re: ColorControls and images
• From: "Tom Rink" <rink@xxxxxxxxxxxxx>
• Date: Mon, 11 Oct 2004 16:31:02 -0500

Hi Tennessee,

I've noticed the same thing.  You'll have to do:

to get this to work.  I'd  have to look more closely
to say why initGreyWedge doesn't do this.  Perhaps
someone could comment.  I think the reason it works
in SatDisplay is that the image data reference is
added to the display *after* the initGreyWedge call
so the grey table is picked up on the display transform.

Tom


On Mon, 11 Oct 2004 06:23:27 -0500 (CDT)
 Bill Hibbard <billh@xxxxxxxxxxxxx> wrote:

Hi Tennessee,

I've got a satellite pic to render which is an image. As such, the only visual scalarmap I can use is RGB. I want to display it in greyscale, but when I try to use initGreyWedge, nothing happens. I've got a code snippet below. When it executes I see the println of "Greyscale" but

then there is no change.

Would you expect this to work?

Yes, since visad/examples/SatDisplay.java uses the same

logic. Try running 'jaava SatDisplay' in the visad/examples

directory. It will read image and map files from the ftp
server at UW, so you may want to modify it to read local
files. Please let us know what you find.

Cheers,
Bill

Code Snippet :

         if(scalarMap != null) {

ColorControl cc = (ColorControl) scalarMap.getControl();

             if(mode == ColorConfigurable.GREYSCALE) {
                 System.out.println("Greyscale");
                 cc.initGreyWedge();
             }

             if(mode == ColorConfigurable.RGB) {
                 System.out.println("RGB");
                 cc.initHSV();
             }
         }

• Follow-Ups:
  • Re: ColorControls and images
    • From: Tennessee James Leeuwenburg

• References:
  • Re: ColorControls and images
    • From: Bill Hibbard