1. An image signal processing method of an imaging apparatus, the method comprising: receiving raw data from an array, the array having a red pixel, a wide green pixel, and a blue pixel therein; correcting the raw data by recovering a local variation of a wide green channel captured from the wide green pixel; white balancing the corrected raw data; denoising the corrected raw data; demosaicing the corrected raw data to recover color channels missing from the corrected raw data; image sharpening the corrected raw data; and performing a color correction with respect to the corrected raw data.