Canon S200 has a
10.0MP 1/1.7 (7.44 x 5.58 mm ) sized CCD sensor and features Digic 5 processor. On the other hand, Canon SD1300 IS has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor and features Digic 4 processor.
Below you can see the S200 and SD1300 IS sensor size comparison.
As seen above, Canon S200 has a 1.5x Larger sensor area than Canon SD1300 IS. Larger sensors give photographer more control on the depth of field and blurry background compared to smaller sensor when shot in same focal length and aperture.