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question for dual image watermark ?

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ghassan78
ghassan78 2014-2-6
编辑： ghassan78 2014-2-6
I have hidden image watermark inside the first cover image, then the result I hid it inside the second cover image, and recovered the first image without problems, but when the second image retrieved from the second cover shows a white (not retrieve image) ..... Why

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