[SANSELAN] PNG, GIF question

[Mihai Catan]

Hi,

I'm using Sanselan to get dpi from jpg and jpeg images and work great.
I tried to get the same thing for png and gif but soesn't work.

        File pngFile = new File("png.png");
        File gifFile = new File("gif.gif");
        File jpgFile = new File("jpg.jpg");
        File jpegFile = new File("jpeg.jpeg");

        IImageMetadata metadata = Sanselan.getMetadata(jpegFile);
        System.out.println(metadata.toString());

Is there a way to get dpi from png and gif file?

Best Regards
Mihai