How to save in file picture generated from array of integers?

hi everyone. i have quite simple (but not for me) problem. here is it:
i generate pattern in array 100x100 of integer and than i want
to save it in file (png or bmp format). after write there is only black
image, without my pattern. what's going on? can anybody help me?
thanks for help. here is my source code
MemoryImageSource mIS = new MemoryImageSource(100,100,pixels,0,100);
Image img;
img = createImage(mIS);
BufferedImage bImg = new BufferedImage(100,100,BufferedImage.TYPE_INT_RGB);
Graphics2D g = bImg.createGraphics();
g.drawImage(img,0,0,null);
try {
   ImageIO.write(bImg,"bmp",new File("output.bmp"));
   }// end try
catch(IOException e) {
   return;
}// end catch(IOException e)
g.dispose();
g=null;

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