Finding a color with a robot

Hey i am making this program and i need an efficient findcolor algorithm i am currently using this:
 public Point FindColor(Color c,int x1,int y1,int x2,int y2,int tol){
 for (int i=y1;i<=y2;i++){
 for(int j=x1;j<=x2;j++){
 if (colorSimilarity(getPixelColor(j, i),c)*100>100-tol){
 return new Point(j,i);
 return null;
 public double colorSimilarity ( Color col1, Color col2 )
 double dr, dg, db;
 dr = col1.getRed() - col2.getRed();
 dg = col1.getGreen() - col2.getGreen();
 db = col1.getBlue() - col2.getBlue();
 return 1-(( Math.sqrt ( ( dr * dr ) + ( dg * dg ) + ( db * db ) ) )/(255*Math.sqrt(3)));
but it takes forever to search the whole screen (by forever i mean 8-9 seconds). any ideas as to how i could improve its efficiency to more like .1-.5 seconds

Crosspost:
http://forum.java.sun.com/thread.jspa?threadID=5125012

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