Fujifilm S4500 has a 14.0MP 1/2.3-inch (6.17 x 4.55 mm ) sized CCD sensor . You can shoot at maximum resolution of 4288 x 3216 pixels with aspect ratios of 4:3, 3:2 and 16:9. S4500 has a native ISO range of 64 - 1600 which can be boosted to 6400 but unfortunately, Fujifilm S4500 doesn't have RAW file support. If you need a DSLR-Like camera with a RAW support, consider or in the same price range.
Fujifilm S4500 is not the highest resolution Small Sensor camera. Canon SX740 HS with its 21.0MP sensor is leading in this class. Check the comparison of Fujifilm S4500 vs Canon SX740 HS or take a look at Highest resolution Bridge cameras list.
Let's look at how the size of the Fujifilm S4500's 1/2.3-inch sensor compares with other standard sensor sizes.
Comparison image of Fujifilm S4500 Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Fujifilm S4500 gives you at any given aperture.
You can
calculate
the exact depth of field for the Fujifilm S4500
at any focal length, aperture and subject distance, including the hyperfocal distance
for landscapes and how close you can get before the focus zone becomes too thin.