BufferedImage does not keep transparency when HSB values for an images is changed

Question

I'm working on a simple image program where the user can alter the HSB values of an image. However, when I change the HSB values of an images and convert back to RGB, it seems to lose it's transparency or alpha values (it goes black where the transparency is). Here's what I have below (I've put the relevant parts together):

public static BufferedImage getEnhancedImagesHSB(BufferedImage image, float[] hsbOrg)
{

  int height = image.getHeight();
  int width = image.getWidth();

  float[] hsb = new float[]{0,0,0,0};
  int[] originalPixels = image.getRGB(0,0, width, height, null, 0, width);
  int[] enhancedImagePixels = image.getRGB(0,0, width, height, null, 0, width);

  for (int i = 0; i < originalPixels.length; i++)
  {
    Color c = new Color( originalPixels[i]);
    int red =c.getRed();
    int green = c.getGreen();
    int blue = c.getBlue();

    hsb = Color.RGBtoHSB(red, green, blue, hsb);

    hsb[ 3 ] = c.getAlpha() / 255f;

     hsb[0] = (float)(hsb[0] +( hsbOrg[0]/360.0));//hue

    hsb[1] *=  (hsbOrg[1]/100);
      if(hsb[1] > 1.0)
          hsb[1] = (float)0.9;


    hsb[2] *=  (hsbOrg[2]/100);
      if(hsb[2] > 1.0) 
          {hsb[2] = (float)0.9;}

    enhancedImagePixels[i] = Color.HSBtoRGB(hsb[0], hsb[1], hsb[2]);
  }


  BufferedImage newImage = new BufferedImage(width, height,    BufferedImage.TYPE_INT_ARGB  );  
  newImage.setRGB(0, 0, width, height, enhancedImagePixels, 0, width);

  return newImage;
}

According to the docs getRGB(), setRGB() use the default RGB color model (TYPE_INT_ARGB) so the alpha values should be preserved. But changing the images HSB values results in the new buffered image having a black color where the transparency should be. How can I edit the images HSB values and then create a new image without losing the images transparency?

Edit: Below is an image from before and after some random Hue, saturation and brightness has been applied. As you can see, the image has lost its transparency.

Answer 1

Color c2 = Color.HSBtoRGB(hsb[0], hsb[1], hsb[2]);
enhancedImagePixels[i] = new Color(c2.getRed(), c2.getGreen(), c2.getBlue(),
        c.getAlpha());

Which is ugly. There seems to be no conversion for hsb[3] (alpha). Using a image.getAlphaRaster() might be the solution.

Answer 2

Thanks to Joop Eggen for pointing me into the right direction. I wrote directly into the image raster (using setPixel()) the adjusted Hue, saturation, brightness and alpha values. Below is a great article discussing the subject matter.

Article.