Setting the color depth of images

Hi,
could someone please let me know how to make images (VolatileImages in particular) have 16 bit depth? By default it seems to use 8bits. My monitor, card, etc certainly allow for better depth. I understand that BufferedImages can be of type USHORT_GRAY, but I certainly need a VolatileImage.
I need to produce a high colordepth grayscale animation (I need to be able to draw on the image, as well as to produce images from an int array - interpreted as an unsigned short array).
I have been looking at numerous class descriptions, as well as sample codes, and could not figure the solution.
Please help

Let me preface this with: I've not done this before, but...
It seems to me that once you are in the graphics mode you want, and you have loaded your image with ImageIO and have a BufferedImage of the appropriate configuration, then you can create a VolitileImage and use the GraphicsContext of that VolitileImage with a drawImage of the BufferedImage...
Graphics2D g = myVolitileImage.createGraphics();
g.drawImage(myBufferedImage, 0, 0, null);
g.dispose();

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