g.drawImage(bi, 0, 0, destVI.getWidth(), destVI.getHeight(), null);
snapshot = destVI.getSnapshot();
} while (destVI.contentsLost());
f.dispose();
int whitePixel = Color.white.getRGB();
for (int y = 0; y < snapshot.getHeight(); y++) {
for (int x = 0; x < snapshot.getWidth(); x++) {
if (snapshot.getRGB(x, y) == whitePixel) {
System.out.printf("Found untouched pixel at %dx%d\n", x, y);