This can work (we do it in our internal systems) - but you have to be very
aware of how PDF works.  The image draw operations are laying the images
down onto a canvas.  You can't just blindly extract the images, because it's
quite possible that the images are designed to be laid down on top of each
other, etc...  (as you've discovered).

We handle this by creating a BufferedImage, then actually rendering the
images onto it (you'll have to do coordinate transformation, bit depth
adjustments, etc...).  It definitely works, but it's not going to be a no
brainer that you can just do using an existing API in iText.

If you want something out of the box, consider licensing JPedal.

Cheers,

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