Problem rotating a non-square image

I am getting very strange results trying to use an AffineTransform to rotate a rectangular but non-square image. If I pre-define a destination Image, then after using the AffineTransform to filter the source, most of the destination image is black (because the resultant image isn't positioned correctly). This is especially true when I try to rotate an image 90 degrees counter-clockwise, in which case I don't know what happens to the rotated image.
If I try to just let the filter method produce a new image to return to me, it returns a completely square image, which cuts off some of the image if it isn't square. I'm really lost as to what to try next. Here is my code...
at = new AffineTransform();
at.setToTranslation( roiImage.getWidth()/2, roiImage.getHeight()/2);
at.rotate( Math.toRadians( angle ) );
at.translate( -roiImage.getWidth()/2, -roiImage.getHeight()/2);
AffineTransformOp atOp = new AffineTransformOp( at, renderingHints );
/* construct the new destination image with the correct post-rotation bounds */
BufferedImage rotatedImage = new BufferedImage( roiImage.getHeight(), roiImage.getWidth(), roiImage.getType() );
atOp.filter( roiImage, rotatedImage );
roiImage.flush();
roiImage = rotatedImage;
Any ideas on why this might be acting so strange? Can I even use an AffineTransform to rotate a non-square image?

could you provide me a code sample? I've tried doing it that way as well, but I'm still having troubles. I think I'm just missing something small and simple :-(
thanks for the quick response.

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