Samsung HZ15W has a 12.0MP 1/2.3-inch (6.08 x 4.56 mm ) sized CCD sensor . You can shoot at maximum resolution of 4000 x 3000 pixels with aspect ratios of 16:9, 4:3 and 3:2. HZ15W has a native ISO range of 80 - 3200 but unfortunately, Samsung HZ15W doesn't have RAW file support. If you need a Compact camera with a RAW support, consider Leica Q (Typ 116) or Casio Exilim EX-10 in the same price range.
Samsung HZ15W 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 Samsung HZ15W vs Canon SX740 HS or take a look at Highest resolution Compact cameras list.
Let's look at how the size of the Samsung HZ15W's 1/2.3-inch sensor compares with other standard sensor sizes.
Comparison image of Samsung HZ15W Sensor Size with other standard sensors
Sensor size is what determines the circle of confusion, and therefore how much
depth of field Samsung HZ15W gives you at any given aperture.
You can
calculate
the exact depth of field for the Samsung HZ15W
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.