How do I save an image in a BufferedImage as a lossy JPEG2000 image?

New to Java! OK, I know how to save it as lossless. What I have so far is:
Iterator writers = ImageIO.getImageWritersByFormatName("JPEG2000");
ImageWriter writer = (ImageWriter)writers.next();
J2KImageWriteParam J2KWriteParam = new J2KImageWriteParam();
J2KWriteParam.setFilter("FILTER_97");
J2KWriteParam.setEncodingRate(0.9); // ??
J2KWriteParam.setCompressionMode(ImageWriteParam.MODE_EXPLICIT); // ?
What do I do next to save the image? I don't understand how to apply J2KImageWriteParam. My images are all 16 bit gray scale and I want to apply just a little compression.
Thanks
Nate

Open the movie with Quicktime Player 7 and go to the File ➙ Export menu. There select Export ➙ Movie to Picture and Use ➙ either jpeg or png.
I'm sure you can do it in iMovie but I don't use the latest version of iMovie so can't help there.
OT

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Attachments:
GrabWhileLoop.png ‏34 KB
MainWhileLoop.png ‏68 KB

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