1. A method of processing an image, the method comprising: generating a plurality of grayscale images from a multi-channel image, the plurality of grayscale images comprising a first grayscale image and a second grayscale image, the first grayscale image distinct from the second grayscale image; identifying at least one text region in the plurality of grayscale images; determining text region information from the at least one text region; and generating text information of the multi-channel image based on the text region information.