From: eckinator
2009/11/24 Larry Colen <[email protected]>:
>
> You forgot the bayer pattern. Each pixel is only one color, so by
> doing the shift, they get all three colors at each pixel. I wonder
> whether the four shots might mean that they have a fourth pixel
> without any color filters that is much more sensitive than the color
> pixels. Either that, or with their pattern, it takes four shots to get
> all colors at all pixels (2 green, one red, one blue).
I see. I was taking pixel to mean image pixel whereas you and maybe
Hassy take it to mean physical pixels / sensor surface units so I
guess we're talking about roughly the same thing. Why would it be 2
green though?
Because that's how a Bayer pattern sensor is laid out.
gr
bg
There's 1 green for each red, and 1 green for each blue - 2g, 1r, 1b.
The sensor would move around so each photo-site gets exposed to the same
part of the image.
SHOT - shift left
SHOT - shift down
SHOT - shift right
SHOT - shift up (returning to home position)
Ready for next image.
It could be done with the same technology Pentax uses to move the sensor
for anti-shake. Hasselblad's engineers just saw another way to use it.
I doubt Pentax could do it with just a Firmware update, but they could
do it if they thought offering the feature would sell more cameras.
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