1. A digital image processing method, comprising the steps of: (A) capturing a digital image; (B) selecting at least a target pixel within said digital image according to a predetermined rule; (C) performing a first filtering on a graphic region including said target pixel and its neighboring pixels within said digital image, to generate a set of first filtered values; and (D) performing a second filtering on said set of first filtered values to generate a set of second filtered values, and performing a digital image adjustment process on said digital image according to said set of second filtered values.