Retraction Note: A color image watermarking scheme based on affine transformation and S 4 permutation (Neural Computing and Applications, (2014), 25, 7-8, (2037-2045), 10.1007/s00521-014-1691-0)

The Editor-in-Chief and the publisher have retracted this article. An investigation by the publisher found a number of concerns, including but not limited to citations which do not support claims made in the text, non-standard phrasing, and image irregularities. Based on the investigation’s findings the Editor-in-Chief therefore no longer has confidence in the results and conclusions of this article. Author Majid Khan disagrees with this retraction. The publisher has been unable to obtain current email addresses for authors Syede Iram Batool and Tariq Shah.