1. A pixel array of an image sensor, the pixel array comprising: a plurality of pixel groups, each pixel group comprising: one or more long exposure pixels; and one or more short exposure pixels, wherein each pixel group includes, from among the one or more long exposure pixels and the one or more short exposure pixels, a first pixel having a white component and second to fourth pixels having first to third color components, and wherein the first pixel belonging to a first pixel group, among the plurality of pixel groups, is a long exposure pixel, and the first pixel belonging to a second pixel group that is adjacent to the first pixel group, among the plurality of pixel groups, is a short exposure pixel.