Samsung WB150F has a
14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . On the other hand, Ricoh GXR P10 28-300mm has a
10.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized BSI-CMOS sensor and features Smooth Imaging Engine IV processor.
Below you can see the WB150F and GXR P10 28-300mm F3.5-5.6 VC sensor size comparison.
Samsung WB150F and Ricoh GXR P10 28-300mm 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 Ricoh GXR P10 28-300mm has 59% larger pixel area (2.81µm2 vs 1.76µm2) compared to Samsung WB150F, it has larger pixel area to collect light hence potential to have less noise in low light / High ISO images.