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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?

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    Are you 100% sure your camera application is taking full resolution images? – whatsisname Jun 22 '17 at 0:55
  • What app did you use? – mattdm Jun 22 '17 at 1:04
  • yup, the problem was that I wasn't using the default camera app. I get the full resolution when I use the camera app. – redcardinal Jun 22 '17 at 2:42
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My iPhone 5S takes 8 megapixel images, specifically, 3264x2448 pixels. This is native size. This is speaking of still images, not the movie images which of course are 1920x1080 or 2 megapixels.

However Apple likes to offer lots of opportunity to export them resampled much smaller, especially for sending with email or text messages, when a large image can be a problem in ill favor. Viewing them on another phone screen can only use about 0.2 megapixels.

But if you download them by connecting the power cord to a computer USB port, you can get the full 8 megapixel images.

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