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. 2015 Mar 31;10(3):e0119660. doi: 10.1371/journal.pone.0119660

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© 2015 Wu et al

This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are properly credited.

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Fig 18 — (a) Brightened cipher-image of Lena, (b) decrypted image under brightening, (c) darkened cipher-image of Lena, (d) decrypted image under darkening.