An image sensor comprising: a plurality of red pixel groups (GR) each including a first red pixel (PXR1) and a second red pixel (PXR2) each configured to sense a red color, the first red pixel (PXR1) and the second red pixel (PXR2) being adjacent to each other in a first direction and sharing a single microlens (MLX) with each other; a plurality of green pixel groups (GG) each including a first green pixel (PXG1) and a second green pixel (PXG2) each configured to sense a green color, the first green pixel (PXG1) and the second green pixel (PXG2) being adjacent to each other in the first direction and sharing a single microlens (MLX) with each other; a plurality of blue pixel groups (GB) each including a first blue pixel (PXB1) and a second blue pixel (PXB2) each configured to sense a blue color, the first blue pixel (PXB1) and the second blue pixel (PXB2) being adjacent to each other in the first direction and sharing a single microlens (MLX) with each other; and at least one color pixel group (GC, GM, GY) including a first color pixel (PXC1, PXM1, PXY1) and a second color pixel (PXC2, PXM2, PXY2) each configured to sense a certain color, the first color pixel (PXC1, PXM1, PXY1) and the second color pixel (PXC2, PXM2, PXY2) being adjacent to each other in a second direction and sharing a single microlens (MLY) with each other, the first direction being perpendicular to the second direction; the certain color is different from the red color, the blue color, and the green color; and the at least one color pixel group (GC, GM, GY) is between one of the red pixel groups (GR) and one of the green pixel groups (GG), and between one of the green pixel groups (GG) and one of the blue pixel groups (GB). a plurality of red pixel groups (GR) each including a first red pixel (PXR1) and a second red pixel (PXR2) each configured to sense a red color, the first red pixel (PXR1) and the second red pixel (PXR2) being adjacent to each other in a first direction and sharing a single microlens (MLX) with each other; a plurality of green pixel groups (GG) each including a first green pixel (PXG1) and a second green pixel (PXG2) each configured to sense a green color, the first green pixel (PXG1) and the second green pixel (PXG2) being adjacent to each other in the first direction and sharing a single microlens (MLX) with each other; a plurality of blue pixel groups (GB) each including a first blue pixel (PXB1) and a second blue pixel (PXB2) each configured to sense a blue color, the first blue pixel (PXB1) and the second blue pixel (PXB2) being adjacent to each other in the first direction and sharing a single microlens (MLX) with each other; and at least one color pixel group (GC, GM, GY) including a first color pixel (PXC1, PXM1, PXY1) and a second color pixel (PXC2, PXM2, PXY2) each configured to sense a certain color, the first color pixel (PXC1, PXM1, PXY1) and the second color pixel (PXC2, PXM2, PXY2) being adjacent to each other in a second direction and sharing a single microlens (MLY) with each other, the first direction being perpendicular to the second direction; the certain color is different from the red color, the blue color, and the green color; and the at least one color pixel group (GC, GM, GY) is between one of the red pixel groups (GR) and one of the green pixel groups (GG), and between one of the green pixel groups (GG) and one of the blue pixel groups (GB). <EOS>