Canon A3000 IS has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Nikon S33 has a
13.0MP 1/3.1' (4.7 x 3.5 mm ) sized CMOS sensor .
Below you can see the A3000 IS and S33 sensor size comparison.
As seen above, Canon A3000 IS has a 1.7x Larger sensor area than Nikon S33. 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.