TIFF dpi scale

Hi, I have a Tiff with horizontal resolution of 204 dpi and verticale res of 84.

In order to see the image not streched I wrote the following code ( setting xres and yres = 200 dpi):

Code:

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public class TiffRescale {
   
   

    private static int DPI_X = 200;
    private static int DPI_Y = 200;


public static void main(String args[]) throws FileNotFoundException, IOException {
  try{   
  File fInputFile = new File("d:\\tif1.tif");
        InputStream fis = new BufferedInputStream(new FileInputStream(
                        fInputFile)); 
       
        IIOImage IIbi;
        TIFFImageReaderSpi spi = new TIFFImageReaderSpi();
        ImageReader reader = spi.createReaderInstance();
        ImageInputStream iis = ImageIO.createImageInputStream(fis);
        ImageReadParam readParam = reader.getDefaultReadParam();
       
        reader.setInput(iis, false);
       
        IIbi = reader.readAll(0, readParam);
       
       
        TIFFImageWriterSpi  spiTiff = new TIFFImageWriterSpi();
        ImageWriter tiffWriter = spiTiff.createWriterInstance();
       
        //lettura metadati
        ImageTypeSpecifier imageType =
            ImageTypeSpecifier.createFromRenderedImage(IIbi.getRenderedImage());
        IIOMetadata imageMetadata =
            tiffWriter.getDefaultImageMetadata(imageType, null);
        /////////////////////////////
        //imageMetadata = setDPIViaAPI(imageMetadata);
       
        //provare:
        //http://www.java.net/node/659630
       
       
        // Derive the TIFFDirectory from the metadata.
        TIFFDirectory dir = TIFFDirectory.createFromMetadata(imageMetadata);
       
      /*
        // Set tag value and tag name.
        String tagName = "XResolution";
        int tagNumber = 282;
        // Add a value to the tag.
        String[] _value = { "200" };
        // Create a new TIFF field including a new TIFF ASCII TIFF tag.
        TIFFTag newTag = new TIFFTag(tagName, tagNumber, (1 << TIFFTag.TIFF_ASCII));
        TIFFField newField = new TIFFField(newTag, TIFFTag.TIFF_ASCII, 1, _value);
        dir.addTIFFField(newField);
        */
       
 
        // Get {X,Y}Resolution tags.
        BaselineTIFFTagSet base = BaselineTIFFTagSet.getInstance();
        TIFFTag tagXRes = base.getTag(BaselineTIFFTagSet.TAG_X_RESOLUTION);
        TIFFTag tagYRes = base.getTag(BaselineTIFFTagSet.TAG_Y_RESOLUTION);
       
        //TIFFTag tagXWidth = base.getTag(BaselineTIFFTagSet.TAG_IMAGE_WIDTH);
       
        //TIFFTag tagRowsPerStrip = base.getTag(BaselineTIFFTagSet.TAG_ROWS_PER_STRIP);
        //TIFFField fieldRowsPerStrip = new TIFFField(tagRowsPerStrip, TIFFTag.TIFF_SHORT, 1, (Object)new char[]{2200});

       
        // Create {X,Y}Resolution fields.
        TIFFField fieldXRes = new TIFFField(tagXRes, TIFFTag.TIFF_RATIONAL,
                                            1, new long[][] {{200, 1}});
        TIFFField fieldYRes = new TIFFField(tagYRes, TIFFTag.TIFF_RATIONAL,
                                            1, new long[][] {{200, 1}});
 
        //TIFFField fieldXWidth = new TIFFField(tagXWidth, TIFFTag.TIFF_RATIONAL,
        //                                  1, new long[][] {{800, 1}});
        // Append {X,Y}Resolution fields to directory.
       
        //dir.addTIFFField(fieldRowsPerStrip);
       
     
        dir.addTIFFField(fieldXRes);
        dir.addTIFFField(fieldYRes);
 
       
        //dir.addTIFFField(fieldXWidth);
 
        // Convert to metadata object and return.
        IIOMetadata newMeta = dir.getAsMetadata();
        //imageMetadata = dir.getAsMetadata();
       
       
        //////////////////////////
        File fOutputFile = new File("d:\\intermedio.tiff");
       
        ImageOutputStream ios = ImageIO.createImageOutputStream(fOutputFile);
       
        tiffWriter.setOutput(ios);
       
        tiffWriter.write(newMeta,
                new IIOImage(IIbi.getRenderedImage(),null,null),
                (TIFFImageWriteParam)tiffWriter.getDefaultWriteParam());
       
        ios.close();
  }
  catch(Exception e)
  {System.out.print(e.toString());
  }
       
 
}


/**
    * Enrico : Set Tiff
 * 
    */
    private static IIOMetadata setDPIViaAPI(IIOMetadata imageMetadata)
        throws IIOInvalidTreeException {
        // Derive the TIFFDirectory from the metadata.
        TIFFDirectory dir = TIFFDirectory.createFromMetadata(imageMetadata);
 
        // Get {X,Y}Resolution tags.
        BaselineTIFFTagSet base = BaselineTIFFTagSet.getInstance();
        TIFFTag tagXRes = base.getTag(BaselineTIFFTagSet.TAG_X_RESOLUTION);
        TIFFTag tagYRes = base.getTag(BaselineTIFFTagSet.TAG_Y_RESOLUTION);
       
        //TIFFTag tagXWidth = base.getTag(BaselineTIFFTagSet.TAG_IMAGE_WIDTH);
       
        //TIFFTag tagRowsPerStrip = base.getTag(BaselineTIFFTagSet.TAG_ROWS_PER_STRIP);
        //TIFFField fieldRowsPerStrip = new TIFFField(tagRowsPerStrip, TIFFTag.TIFF_SHORT, 1, (Object)new char[]{2200});

       
        // Create {X,Y}Resolution fields.
        TIFFField fieldXRes = new TIFFField(tagXRes, TIFFTag.TIFF_RATIONAL,
                                            1, new long[][] {{200, 1}});
        TIFFField fieldYRes = new TIFFField(tagYRes, TIFFTag.TIFF_RATIONAL,
                                            1, new long[][] {{200, 1}});
 
        //TIFFField fieldXWidth = new TIFFField(tagXWidth, TIFFTag.TIFF_RATIONAL,
        //                                  1, new long[][] {{800, 1}});
        // Append {X,Y}Resolution fields to directory.
       
        //dir.addTIFFField(fieldRowsPerStrip);
       
       
        dir.addTIFFField(fieldXRes);
        dir.addTIFFField(fieldYRes);
       
        //dir.addTIFFField(fieldXWidth);
 
        // Convert to metadata object and return.
        return dir.getAsMetadata();
    }

}

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the issue is that the result "intermedio.tiff" is streched as before and has xres = 1 dpi = yres = 1 DPI !!!
Can anyone help me?
thanks
regards,
Enrico

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