According to the specifications given by Apple, the iPhone 5s camera has 8 megapixels. I assume that this is supposed to mean that the image sensor has 8 million photosites, and I would appreciate it if someone could confirm this.
Now when I import a photo from the iPhone to my laptop, the photo has a resolution of 1632 x 1224 pixels (as determined by looking at the photo properties). This is a total of about 2MP.
From the answer given by jrista in this question, I can understand why there are more photosites on the sensor than pixels in the image, but that explanation doesn't account for a difference of several million. Where is this discrepancy coming from?