Convert image into TIFF 4

I have a requirement to convert images from TIFF 6 to TIFF 4. I have been able to convert to TIFF without compression. However, to reduce the file sizes I need to implement compression_group4. Although it is listed as being supported . . . it does not appear to be.
Any ideas?

(1) Are you using compression? I can create TIFFs but not compress them using .COMPRESSION_GROUP4
(2) When I try and use JAI's ImageCodec (specifically TIFFEncodeParam) and specify COMPRESSION_GROUP4 I get a run-time error: "java.lang.Error: Unsupported compression scheme specified."
(3) This error seems to be generated by the line .setCompression, as I have been able to generate the error without specifying an image. (ie: it's not related to this image not being supported)
(A) Here is the code I'm using:
OutputStream os = new FileOutputStream(destinationFile); //where destinationFile is a File object representing the saved file
TIFFEncodeParam param = new TIFFEncodeParam();
param.setCompression(TIFFEncodeParam.COMPRESSION_GROUP4);
ImageEncoder enc = ImageCodec.createImageEncoder("TIFF", os, param);
enc.encode(src); //where src is a RenderedImage Object
os.close();
any ideas?
Thanks in advance!

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