Re: color control

• To: Shin-ta Huang <shinta@xxxxxxxxxxxxxx>
• Subject: Re: color control
• From: Bill Hibbard <hibbard@xxxxxxxxxxxxxxxxx>
• Date: Wed, 12 Apr 2000 13:08:49 -0500

Hi Shinta,

>    Here is my question about how to let the color more bright.
> 
> ex. the data structure is below
> 
>    (XAxis,YAxis)-> temp on a DisplayImplJ3D
> 
>    dpys[0].addMap(new ScalarMap(RealType.XAxis, Display.XAxis));
>    dpys[0].addMap(new ScalarMap(RealType.YAxis, Display.YAxis));
>    dpys[0].addMap(new ScalarMap(Temp, ?)); // use single color to show
> various temperture
>    dpys[0].addMap(new ConstantMap(?,?));
> 
>   If there is some way to let the whole simulation model more bright in
> black bcakground.
> Because the final color will control by " dpys[0].addMap(new
> ScalarMap(Temp, ?));". The whole model will change into more grey and
> unclear.  or Is it possible to change the the scale color and structure
> color to black on other color background?

You could try:

  ScalarMap cmap = new ScalarMap(Temp, Display.RGB);
  dpys[0].addMap(cmap);
  LabeledColorWidget lcw = new LabeledColorWidget(cmap);

Then add(lcw) to your GUI somewhere and experiment with
color lookup tables that will give you a brighter image.
Or you could try computing a color table:

  ColorControl control = (ColorControl) cmap.getControl();
  float[][] table = new float[3][256];
  for (int j=0; j<256; j++) {
    table[0][j] = ... // j-th red
    table[1][j] = ... // j-th green
    table[2][j] = ... // j-th blue
  }
  control.setTable(table);

Note also that with Java3D colors can be a bit less bright,
because of the shading algorithm.

Good luck,
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:
  • color control
    • From: Shin-ta Huang