Problem with alpha of pixels

Hi, i've a little problem, i've a method that get the pixels of an bufferedimage and set they to black or white values. My problem is only with the PNG files, i don't succeed to remove the transparence and when i show the image into my panel the black part is not completely black but there's still a transparence.
My bufferedimage's name is "sorgente" and this is the code of method.
<CODE>
boolean test_image (){
int w = sorgente.getWidth();
int h = sorgente.getHeight();
int[] rgbs = new int[w*h];
String ttmp = "";
int w_img = sorgente.getWidth();
int h_img = sorgente.getHeight();
int pixelCache, r, g, b, alpha;
for (int i = 0; i < w_img; i ++){
for (int j = 0; j < h_img; j ++){
pixelCache = sorgente.getRGB(i, j);
r = (pixelCache >> 16) & 0xff;
g = (pixelCache >> 8) & 0xff;
b = pixelCache & 0xff;
alpha = (pixelCache >> 24) & 0xff;
if (!((r == g) && (g == b)))
return false;
if ((r != 255) || (r != 0)){
if (r < 160){
sorgente.setRGB(i, j, 0x00000000);
} else {
sorgente.setRGB(i, j, 0xffffffff);
return true;
</CODE>
THANKS

sorgente.setRGB(i, j, 0x00000000); sets the alpha channel to transparent. Try setting the color to 0xFF000000

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