A method of an electronic device including an image sensor that acquires an optical signal corresponding to an object and a controller that controls the image sensor, is provided. The method includes identifying a mode for generating an image corresponding to the object by using the optical signal, determining a setting of at least one image attribute to be used for generating the image at least based on the mode, generating image data by using pixel data corresponding to the optical signal at least based on the setting, and displaying the image corresponding to the object through a display functionally connected to the electronic device at least based on the image data.