Casio EX-FC100 has a
9.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CMOS sensor . On the other hand, Canon D30 has a
12.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features DIGIC 4 processor.
Below you can see the EX-FC100 and D30 sensor size comparison.
Casio EX-FC100 and Canon D30 have the same sensor sizes so they will provide same level of control over the depth of field when used with same focal length and aperture. On the other hand, since Casio EX-FC100 has 33% larger pixel area compared to Canon D30, it has potential to collect more light on pixel level hence have less noise in low light / High ISO images.