public static BufferedImage toGrayScale(BufferedImage image) {
BufferedImage result =
new BufferedImage(image.getWidth(), image.getHeight(), BufferedImage.TYPE_BYTE_GRAY);
Raster raster = image.getData();
WritableRaster grayRaster = result.getRaster();
int height = raster.getHeight();
int sample = 0;
for (int x = 0; x < raster.getWidth(); ++x) {
for (int y = 0; y < height; ++y) {
sample = raster.getSample(x, y, 0) + raster.getSample(x, y, 1) + raster.getSample(x, y, 2);
grayRaster.setSample(x, y, 0, (int) ((float) sample / 3.0));
}
}
return result;
}
