From: Irregular Webcomic!
2012-12-13 Rerun commentary: This strip shows the difficulty in shooting photos containing large areas of black (Vader) and large areas of white (the troopers). It’s hard to show detail in the black objects without blowing out the highlights and overexposing the white objects, and hard to show detail in the white objects without underexposing the black objects. Our eyes have a much greater ability to simultaneously see details in dark shadows and bright highlights than modern camera sensors do.
The technical term for this range of brightnesses that can be distinguished before losing details is dynamic range. We say that our eyes have a larger dynamic range than camera sensors.