I NEED HELP PLZZZ!!!

Question

Hiiiiiiii....
i'm trying to write a program which converts colored images to gayscale and saves them.The onle problem is that when i convert them they get to be so dark unlike when i try to do it with photoshop..
can anyone help me plzzzz...
i really neeeed someones help.
This is what i have come up with.. plzz if anyone has better solution or can correct mine i'ld be really thankful.
public static void writeImage(String fn, byte[] data, int width, int height)throws FileNotFoundException, IOException {
FileOutputStream fOut = new FileOutputStream(fn);
JPEGImageEncoder jpeg_encode = JPEGCodec.createJPEGEncoder(fOut);
int ints[] = new int[data.length];
for (int i = 0; i< data.length; i++){
ints[i] = 255 << 24 |
(int) (data[i] & 0xff) <<16 |
(int) (data[i] & 0xff) << 8 |
(int) (data[i] & 0xff);
BufferedImage image = new BufferedImage(100,100,
BufferedImage.TYPE_BYTE_GRAY);
image.setRGB(0,0,width,height,ints,0,width);
jpeg_encode.encode(image);
fOut.close();
where data=jpgFile.getBytes();
note:i don't want the images just to look like grayscale i really want them to be grayscale so when i use an if statement like:
if(image.getType() == BufferedImage.TYPE_BYTE_GRAY)it would work.
thanxxxxxxxxxxxxxxxxxxxxxxxxxx

Answer 1

for (int i = 0; i< data.length; i++){
ints[i] = 255 << 24 |I think you can just leave the alpha channel at zero. Anyway...
(int) (data[i] & 0xff) <<16 |
(int) (data[i] & 0xff) << 8 |
(int) (data[i] & 0xff);
}OK, what you're doing here is taking the blue channel and copying it to red and green. The result's grayscale, sure, but it's probably not what you want.
Instead, take the red, green and blue and average them. Then put that averaged value into all 3 channels. Something like...
gray = (int)((
(data[i] & 0xff0000) >>16 |
(data[i] & 0xff00) >>8 |
(data[i] & 0xff) ) /3);
ints[i] = (int) (gray) <<16 |
(int) (gray) << 8 |
(int) (gray);
note:i don't want the images just to look like
grayscale i really want them to be grayscale so when iIf the red green and blue are the same, it's grayscale...
Hope that helps.