Getting pixel values for an image

Question

Hi,
I am trying to compare images to detect where the differences between them occur. I am encountering a few problems
1) when i print out the pixel values for the image,all values are the same - clearly wrong, code i use:
ImageIcon icon = new ImageIcon("x.jpg");
Image image = icon.getImage();
int width = image.getWidth(null);
int height = image.getHeight(null);
BufferedImage buffImage = new BufferedImage(width, height, BufferedImage.TYPE_INT_RGB);
int[] rgbs = new int[width*height];
buffImage.getRGB(0, 0, width, height, rgbs, 0, width);
for(int i = 0; i<width;i++){
for(int j = 0; j<height; j++){
int rgb = buffImage.getRGB(i, j);
System.out.println("pixel @(" + i + "," + j + ") " + rgb );
and 2)when i compare 2 completely different images my code tells me they are the same...
for(int i = 0; i<width;i++){
for(int j = 0; j<height; j++){
int rgb1 = buffImage.getRGB(i, j);
int rgb2 = buffImage2.getRGB(i, j);
if(rgb1 == rgb2)
matches++;
weHaveAMatch = ((int)((float)matches/(float)pixelCount*100) >= tolerance);
Can any1 please tell me what I am doing wrong or show me how to detect differences between images correctly. Any help is much appreciated

Answer 1

so my for loops were just in the wrong order?No, I don't think you were looping over the image you loaded. It appears that you load one image, but loop over another newly created (hence, blank) image.
I'm having trouble using BufferedImage im = ImageIO.read.. the compiler is telling
me that the method read is not recognised even though i have imported
import javax.imageio.*;you must learn to read the APIs and pay attention to the compiler error messages. ImageIO.read takes either a
-File
-InputStream
-URL
-ImageInputStream
In my example, I pass in a File, so it works. You must still be passing a String.
When i create a bufferedImage the way i originally did,the values printed out are still all -16777216.Yes, because you created a new, blank image, so the value reflects this.
Sorry i'm a complete beginner, can u give me some guidence!Thats ok, everyone is at some time. Guidance : read and understand.