1. A method for image-processing, said method comprising: modifying, by an image-processing device, adjusted pixel values of one or more pixels in a region of a multi-channel image in accordance with a pre-specified signal pattern based on one or more parameters; and determining, by said image-processing device, a score based on a ratio of a pixel difference value and a maximum pixel step value that corresponds to modified pixel values of said one or more pixels in said region when said maximum pixel step value exceeds a threshold noise level for said region; and suppressing, by said image-processing device, false color present in said region of said multi-channel image based on said determined score when said false color is identified in said region.