1. An image tuning method for use in a photographic system, comprising: capturing an image by an image sensor of the photographic system; analyzing an image content of the captured image to obtain a plurality of candidate images using a preference search strategy; providing the plurality of candidate images for selection by a user of the photographic system; determining an output image based on one of the candidate images selected by the user; adjusting the preference search strategy by using the user's selection; and when the user's selection is detected as an uncertain preference or a fake preference, ignoring the user's selection for adjusting the preference search strategy with respect to the predetermined category associated with the user's selection.