Gif images, pixels and hex colors

Question

I'm not a java developer, though I at least have attempted to learn it. This may be a strange place to ask this question but java keeps coming up in my search so what the heck!
I am a highschool biology teacher-to-be and I am trying to design a lesson about DNA transcription and translation. I want the students to play a game where they take hex color codes (codons) and place a color card (amino acid) the hex code represents so that they build a big pixelated picture (the protein). I don't want to do the work of writing down the hex code for each and every pixel of the image, and was hoping there was some way to reveal as a list the hex color of each pixel in some sort of ordered fashion. I tried just dragging a gif file into a text program, but that didn't do it, ha!
Any ideas?
Thanks

Answer 1

mport javax.imageio.*;
import java.io.*;
import java.awt.image.*;
public class Test {
    public static void main(String[] args) throws Throwable{
     BufferedImage bi = ImageIO.read( new File( args[0] ) );
     for( int x = 0; x< bi.getWidth(); x++ ) {
         for( int y = 0; y< bi.getHeight(); y++ ) {
          System.out.print( Integer.toHexString( bi.getRGB( x, y ) ) + "," );
         System.out.println( "" );
}Compile:
javac Test.java
run:
java Test theNameOfImage.gif
??