Binary image

Question

I want to convert a image to a binary image(only black& white)
I use this code to convert a color image to a grayscale image:
public static BufferedImage applyGrayscaleFilter(BufferedImage aImage)
BufferedImage tmpBufImage = aImage;
try
for (int i = 0; i < aImage.getWidth(); i++) {
for (int j = 0; j < aImage.getHeight(); j++) {
Color c = new Color(aImage.getRGB(i, j));
int r = c.getRed();
int g = c.getGreen();
int b = c.getBlue();
//formula for grayscale
int gray = (int) (0.2989 * r + 0.5870 * g + 0.1140 * b);
c = new Color(gray, gray, gray);
tmpBufImage.setRGB(i, j, c.getRGB());
catch(Exception ex)
return null;
return tmpBufImage;
I need help for convertin this image(grayscale) to binary image (b&w - only 1 and 0).

Answer 1

No need to do it yourself, BufferedImage will do it for you:
Image oldImage= ...;
BufferedImage newImage=new BufferedImage(oldImage.getWidth(null),
    oldImage.getHeight(null), BufferedImage.TYPE_BYTE_BINARY);
newImage.getGraphics().drawImage(image, 0, 0, null);