> For extra credit:
> Do you really want 150 dpi in the output jpeg? (ie so that viewers would
> also scale it appropriately?)
> If you want to save resolution information then YES you do have to
> do more. Go to the website and locate the imageio guide in pdf, ps or
> html and check out the JPEG metadata spec
> -phil.

Ok, I'm stuck again. Here's what I have so far...

    public static void main(String[] args)

                //create a colored square
        BufferedImage bi = new BufferedImage(100, 100,
        Graphics2D biContext = bi.createGraphics();
        biContext.fillRect(0, 0, 200, 200);

        Iterator i = ImageIO.getImageWritersByFormatName("jpeg");
        //are there any jpeg encoders available?

        if (i.hasNext()) //there's at least one ImageWriter, just use the
first one
            ImageWriter imageWriter = (ImageWriter) i.next();
            //get the param
            ImageWriteParam param = imageWriter.getDefaultWriteParam();
            ImageTypeSpecifier its = new

            //get metadata
            IIOMetadata iomd =

            String formatName = "javax_imageio_jpeg_image_1.0";//this is the
DOCTYPE of the metadata we need

            IIOMetadataFormat format = iomd.getMetadataFormat(formatName);

            String[] strings = format.getAttributeNames("app0JFIF");
            //change density to 150DPI   - how?

            for (int s = 0; s < strings.length; s++)
                String string = strings[s];

                System.out.println(string);   //print out the attribute
names for the element I want to change

when I run this method I get this output:


I want to change the resUnits, Xdensity, and Ydensity values.....but every
class I look at in metadata seems to have protected methods for changing
attributes. I'm stumped. I don't even know how to querry what the current
values for these attributes are.

I want to give resUnits a value of "1" for dots/inch, and give
Xdensity/Ydensity values of 150.

Any clues for me? Thanks!


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