Assigning an RGB Value variable that doesnt Change

Question

Hi,
I have been working on a program that takes an image, tuurns all the dark pixels to blue ones and then finds the bounderies of the blue areas. Im having difficulty detecting the Blue pixels
Im using
BufferedImage.getRGB(x,y) to get the value of a blue pixel
I assigned the blue value as int blue = 0xff;
but the program doesnt seem to pick up the same RGB value each time !
Thanks for the help
Graeme

Answer 1

Hi,
The code i used for fliping the coords below, Ive not touched ColorModels didnt think it was nessecary if it was just a straight forward color comparison. It sets the color but seems to be reading it in differently
bi = getBufferedImage("C:/GB Y4/Project/Backups Project/lego/VisionSystem/Workstation/Images/image.jpeg",this);
          rgb = 0;
          // loops through and gathers the rgb values for the Image !!
          for(int a =0; a < 320; a++){
          for(int b =0; b < 240; b++){
          rgb = bi.getRGB(a,b) ;
          red = (rgb / 0x10000) & 0xff ;
          green = (rgb / 0x100) & 0xff ;
          blue = rgb & 0xff ;
          //System.out.println("Blue :" +blue );
          // loops through all the pixels in the Image 240 X 320 = 76000 pixels
          // If a Black pixel then find edge
     if(red > 0 && red < 60 || green > 0 && green < 80 || blue > 0 && blue < 80 ){
               // TESTING (See if coordinates are being scanned)
               //System.out.println("Black pixel found at (" + a +","+ b +")");
               //     Replacing Pixels re-write the image boundery in Blue
               bi.setRGB(a,b,0xff0000ff );
               // TESTING
               //     Saving the Position of all the Blue Pixels
               savePos(a,b);