Digital BW, The Print

I see. So without interpolation my little 4 pixel grid would be analogous to
putting on a camera lens a filter which is split into 4 quadrants of color,
which would give wacky data.

Then how is grayscale handled? Are every 4 sensors averaged into one, or is
interpolation done for each sensor individually?

Todd

> But in a typical digital camera there's a color filter placed over the chip
> such that your 4 pixel grid would be:
> 
> [R][G]
> [G][B]
> 
> ...so there's no way to take a pure grayscale image, because there's a color
> filter stuck on the chip. The camera can't not interpolate in greyscale
> mode, because the only data it's capable of capturing is alread filtered for
> color. See: http://www.foveon.com/interp.html
> 
> -Jason
> 
>> -----Original Message-----
>> From: Todd Flashner [mailto:tflash@...]
>> Sent: Thursday, February 07, 2002 1:23 AM
>> To: DigitalBlackandWhiteThePrint@yahoogroups.com
>> Subject: Re: [Digital BW] Re: Digicam in BW mode, how to test
>> 
>> Say your sensor is a grid of two sensors across by two down. In grayscale
>> mode you get a 4 pixel capture. You have 4 pixels of detail,
>> represented by
>> one channel which has 4 pixels.
>> 
>> If the camera then applies an algorithm to give each of those
>> pixels an RGB
>> component, that requires interpolation, and you'll end up 3 channels at 4
>> pixels each. You've added color channels, through interpolation, which may
>> or may not contain an accurate representation of the color they
>> are tying to
>> create, but you've added no detail.
> 
> 
> 
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