So an article discussing 2K vs. 4K images popped up on my radar today. It’s named ‘The Truth About 2K and 4K’ and is an interview with John Galt of panavision. It’s partially a marketing piece for Panavision, so take a grain of salt to some of the ‘truth’. On one hand he disparages the RED camera (panavision competitor) for not having a true 4K sensor (this is apprently true) and then later in the article he disparages IMAX (panavision competitor) for being 4K but that it doesn’t really matter because our eyes can normally only see 2K worth of detail. Uh… so that means RED actually got it right?
The jist of it is that RED, like Canon/Nikon DSLRs, uses a sensor with a Bayer mosaic pattern. Each spot (viewsite) on the sensor only receives one color (R, G, or B). 4 (Green gets counted twice) of those are added up to produce one pixel in your camera. Because of this, technically the image RED produces (and Canon and Nikon and…) is interpolated. The alternative is to have each spot on the sensor record all three colors at once. There is a GREAT comparison of the Canon 5D with the Sigma SD14 (which does use a sensor that captures all three colors on the same spot) and explains the difference between sensors very well:
Between both articles it brings up some interesting questions for RED users and for digital photographers.