PLEASE HELP - JAI create a tiff file

Question

Hi people,
I am trying to reate a TIFF file compressed for a Fax Server. The resolution of such an image must be 200dpi by 100dpi as per server requirements.
I am managing the create a tiff file with these requirements. However, since I am using a resolution of 200dpi by 100dpi, the final image is squashed vertically. The following is the code which I am using.
// loading the image
RenderedImage src = myCreateImage();
// this is a proprietary method which returns a RenderedImage
// Specifing the tompression Group
TIFFEncodeParam param = new TIFFEncodeParam();
param.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
//set the image resolution to 200 x 100
TIFFField[] extras = new TIFFField[2];
extras[0] = new TIFFField(282, TIFFField.TIFF_RATIONAL, 1, (Object)new long[][] {{(long)200, (long)1},{(long)0 ,(long)0}});
extras[1] = new TIFFField(283, TIFFField.TIFF_RATIONAL, 1, (Object)new long[][] {{(long)100, (long)1},{(long)0 ,(long)0}});
param.setExtraFields(extras);
OutputStream outputStream = new FileOutputStream ("c:/test.tif");
TIFFImageEncoder encoder = new TIFFImageEncoder (outputStream, param);
encoder.encode(src);
outputStream.close();
outputStream = null;
Any help would be highly appreciated
Thanks & Regards
George Azzopardi

Answer 1

Maybe it's because you're not setting the resolution unit (tag 296)
Example:
TIFFField[] extras = new TIFFField[3];
extras[0] = new TIFFField(282,TIFFField.TIFF_RATIONAL, 1, (Object)new long[][] {{200,(long)1},{(long)0 ,(long)0}}); //x
extras[1] = new TIFFField(283,TIFFField.TIFF_RATIONAL, 1, (Object)new long[][] {{100,(long)1},{(long)0 ,(long)0}}); //y
//set resolution unit to inches
extras[2] = new TIFFField(296, TIFFField.TIFF_SHORT, 1, (Object) new char[] {2}); //2 for inches
param.setExtraFields(extras);