Some embodiments of the application disclose a method of previewing an image on a terminal, including: starting at least one camera of a rear dual camera of the terminal, controlling the at least one camera to enter a low-power monitor state; obtaining brightness information and color temperature information of the current scene using the at least one camera in the low-power monitor state; updating in real time automatic exposure parameters of the current scene using the obtained brightness information, and updating in real time color temperature parameters of the current scene using the obtained color temperature information; obtaining an image of the current scene using a camera upon reception of an instruction for starting the camera; correcting color temperature and brightness of the obtained image using the color temperature and automatic exposure parameters of the current scene updated in real time; and outputting the corrected image as a preview image.