1. An image signal processor, comprising: an image signal frequency zone limiter that limits a frequency zone of an input pixel signal; an image signal frequency zone enhancer that enhances a frequency zone of an input pixel signal; an edge character detector that detects a character of an edge of an input image signal; and a gain controller that controls and outputs output pixel signals from the image signal frequency zone limiter and the image signal frequency zone enhancer according to the output of the edge character detector.