This question relates specifically to images produced by a Canon camera, but I suspect the same issues exist for images produced by any camera.

Before loading a jpg image in PS CS4, the image may contain a whole slew of exif data properties such as lens model, auto-focus points, auto-focus mode, exposure mode, firmware version, auto-exposure bracketing mode, firmware version, etc. and much more. After editing the image and saving to a new file, Much of the exif data is gone.

How can I configure CS4 to preserve ALL existing exif metadata when saving an image?

Thanks for any help.