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You don't need to delete

You don't need to delete LibRawProcessor (if you plan to process another image).

There are two calls:
LibRaw::free_image() - frees image[] array. You may call raw2image() again and you'll get another image[] allocated.

LibRaw::recycle() - frees all allocated data for file (it will be called automatically on next open_file())

-- Alex Tutubalin