This paper presents a method for integrating gamma correction and gain control functions on a CMOS image sensor with logarithmic response. The proposed method is based on a fact that gain variation and level shifting in logarithmic compressed domain are equivalent to the gamma correction and the gain control, respectively, in the exponentially expanded domain. The prototype chip integrating proposed function is fabricated with triple-metal double poly-silicon n-well 0.6μm CMOS technology. As a result of calculation using measurement data of test circuits, the gamma value can be adjusted to 0.45 when the gain given in the logarithmic compressed domain is 0.741, and a gain of 20dB is obtained by the voltage level shift of 60mV.