Telecine's and film scanners these days fall into two camps, the CCD
camp tend to use Xenon lamps, but some use HMI's some high power LED
lights, the CRT camp tend to use some kind of detector like a
photo-multiplier and so on. As was already pointed out the CCDs are
tri-linear meaning no bayer type pattern and a 'true' full coverage
sensor so when we say 4K we mean 4096*3 sensor sites not a fractional
amount determined by the filter array (we also mean 6K when we say 6K
:-).

there are lots of things that need 'negative' values (but not in
absolute systems), the most obvious is allowing for out of gamut
colours to pass through linear matrix systems when doing RGB type
conversions. 

Kevin
-- 
| Kevin Wheatley, Cinesite (Europe) Ltd | Nobody thinks this      |
| Senior Technology                     | My employer for certain |
| And Network Systems Architect         | Not even myself         |


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