Saving modifled ARGB values in an Integer array to a jpeg file?

Question

Hi,
I have searched sites and forums and it seems that the key to this is to use BufferedImage and Graphics's drawImage(). But how can I use the drawImage when I only have an array of integer values?
I went through the docs and seems that BufferedImage class's setRGB() method may suit my purpose but the results were negative. The saved jpeg was just painted black instead of the photo.
Does my code below make any sense or am I missing out something here? Any help will be greatly appreciated!
//from my code, oneDPix is an int[] array containing modified ARGB values
BufferedImage buff = new BufferedImage(imgCols,imgRows,BufferedImage.TYPE_INT_ARGB);
Graphics2D g = buff.createGraphics();
buff.setRGB(0,0,imgCols,imgRows,oneDPix,0,imgCols);
try {
     String targetFile = "/Users/cover.jpg";
        ImageIO.write(buff,"jpg", new File(targetFile));
        } catch (IOException ex) {
            ex.printStackTrace();
        }

Answer 1

hi, if your array has the right values, then you could use the createImage method of the class Toolkit and teh class MemoryImageSource for making the image before, something like this:
Image ima = Toolkit.getDefaultToolkit().createImage(new MemoryImageSource(numOfColumns, numOfRows, ColorModel.getRGBdefault(), array, 0, numOfColumns));
BufferedImage bi = new BufferedImage(numOfColumns, numOfRows, BufferedImage.TYPE_INT_RGB);
Graphics g = bi.getGraphics();
g.drawImage(ima, 0, 0, null);
g.dispose();
ImageIO.write(bi,"jpg",new File(targetFile));hope this helps