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Objectives: The retinex algorithm efficiently recovers image details in the dark regions. That is mainly due to the separation of illumination and reflection in images as well as the logarithm that is similar to the human vision system. However, it fails to recover details in bright regions. This paper proposes a modified approach introducing a new logarithm formula to obtain contrast improvements in both dark and bright regions. Methods/Statistical analysis: The proposed method suggests usingdoi:10.17485/ijst/2015/v8i1/108372 fatcat:flmu5gpxsnbabitxwxjhbwmnty