3. Photoshop allows fine adjustment of the "levels" of signal in an image, providing modification of both the brightness and contrast features of an image, as well as gamma value. Given a histogram like the one below, explain what effect the manipulations described below would have on the bright, dark and medium tones within the image. Also indicate whether the manipulation is typically allowed for scientific images or whether it would require justification. a. Adjustment of the right hand slider to the left. b. Adjustment of the middle slider to the left. c. Adjustment of the left hand slider to the right. d. Adjustment of the right hand slider to the left and the left hand slider to the right