Creating colour image map from an array of integers

Question

not really that relvant to swing, or in fact java even but i wasnt sure where to ask it so:
i have an array of integers that represents information about each pixel in an image. i.e. for every pixel there is an integer value.
at the moment i create another image from a quantised version of these integer values, which gives me a greyscale image, where black is low intensity info and white is high.
however what i want to do is create a colour image like you see, for example, on weather forecasts. where low intensity info is blue, then purple, then red, orange, yellow and then white being the highest.
i need some kind of algorithm that does this. does anybody have some code that does this already?
thanks
kevin

Answer 1

sorry for not replying sooner sniper. thanks for your help but i have solved the problem:
thanks to my mate marc for the code.
import java.awt.Color;
/** Class to assist in assigning color to a mathematical value.
*  Data values must be normalized.
*  @author Marc Ramsdale
*  Written 20th August 2003
public class ColorScale {
     /** Receives a normalized value (between 0.0 - 1.0)
      *  The constructor then creates a colour according
      *  to the selected colour scale.
      *  If value is outside range 0.0 - 1.0 colour is java.awt.Color.BLACK
      *  @param double value - (between 0.0 - 1.0)
     /** Maps the normalized value to a color
      *      BLUE      *
      * GREEN    *      *
      * RED           *
     public static Color generateColour(double value) {
      double red = 0.0;
      double green = 0.0;
      double blue = 0.0;
      Color color;
      int gradient = 4;
      int offset1 = 2;
      int offset2 = 4;
          if((value >= 0.0) && (value < 0.25)) {
               red = 0.0;
               green = value * gradient;
               blue = 1.0;               
          else if((value >= 0.25) && (value < 0.5)) {
               red = 0.0;
               green = 1.0;
               blue = -(value * gradient) + offset1;
          else if((value >= 0.5) && (value < 0.75)) {
               red = (value * gradient) - offset1;
               green = 1.0;
               blue = 0.0;
          else if((value >= 0.75) && (value <= 1.0)) {
               red = 1.0;
               green = -(value * gradient) + offset2;
               blue = 0.0;
          return new Color((float)(red), (float)(green), (float)(blue));