Originally posted by ogl YOU ARE RIGHT!
All tests are confirmed that real resolution of SD14 is not above 6.5-7 MP bayer sensor.
I wouldn't say "all tests" -- Popular Photography puts it more on par with 8mpix bayer sensors in JPEG and almost like 10mpix in RAW. They're usually pretty generous in their testings, but then, that generosity goes to the competition too.
Anyway, that's not really the point -- both sensor types use a subpixel-based design, just differently. The bayer array gets more resolution by interpolating color into final files which use one pixel per subpixel, but again, that's just what font rendering on laptop screen does and doesn't actually mean you have any more "real" pixels in the sensor.
...
I just came across an interesting paper on rendering raw Bayer data to LCD screens in a way that takes advantage of this. Basically, does the color interpolation with translation from bayer subpixels (whatever you want to call them) to LCD subpixels, rather than bayer->"naïve" whole pixels. Pretty cool:
http://www.cs.ubc.ca/~atcheson/f/atcheson%20-%20subpixel%20rendering%20of%20...d%20images.pdf
Which underscores another point I should make: I'm not saying the Bayer approach is
bad (in fact, I think it or something like it has more of a future than Foveon). It just
does use an interpolated subpixel approach, which can even be exploited for useful display improvements.