Guest Daniel J. Ashley-Smith Posted August 2, 2004 Share Posted August 2, 2004 I?ve just bought a book by Michael Freeman, on digital photography. Looking at the CCD section, he states that in order to get a higher res, you need more or larger CCD's. Why not just have one big CCD? When cameras have 3, is there 1 CCD dedicated for each colour or something? :unsure: Link to comment Share on other sites More sharing options...
Guest Daniel J. Ashley-Smith Posted August 2, 2004 Share Posted August 2, 2004 And I suppose colour fringing is when the spd's are not separated properly and mix? Link to comment Share on other sites More sharing options...
Nate Downes Posted August 2, 2004 Share Posted August 2, 2004 You got it, when a camera has 3 CCD's, each one is dedicated to a single color. Rather than using multiple frequency CCD's, you have instead higher-sensitivity B&W CCD's with a color filter in front of them, much like how Technicolor film worked. B&W CCD's mind you have more sensitivity than color ones. The end result is a more detailed color image. New CCD's have more unusual concepts, like multiple-layer of color information. Each layer of the board has sensors designed for different frequencys of light. A 3CCD for cheaper. This takes advantage of the fact that different light wavelengths penetrate silicon differently. Only 1 company I know of uses this technology, and only for still cameras. 3CCD's still have a huge leap in terms of quality and performance over single-chip CCD's. Link to comment Share on other sites More sharing options...
Guest Daniel J. Ashley-Smith Posted August 2, 2004 Share Posted August 2, 2004 Are there individual spd's for each and every pixel? Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted August 2, 2004 Premium Member Share Posted August 2, 2004 Hi, What d'you mean by SPD in this context? Phil Link to comment Share on other sites More sharing options...
Alvin Pingol Posted August 3, 2004 Share Posted August 3, 2004 I would guess "Single Photon Detector"? :huh: Link to comment Share on other sites More sharing options...
Nate Downes Posted August 3, 2004 Share Posted August 3, 2004 If he means that, then no, there are 3 per pixel, one for Red, one for Green and one for Blue (or 4 if you run one of Sony's 4-color CCD's). If you just had one per pixel, you'd have black and white. Link to comment Share on other sites More sharing options...
Guest Daniel J. Ashley-Smith Posted August 3, 2004 Share Posted August 3, 2004 Silicon photo diodes, which were used as light meters through the lens but now their job is to actually capture the light. Link to comment Share on other sites More sharing options...
Guest Daniel J. Ashley-Smith Posted August 3, 2004 Share Posted August 3, 2004 I would guess a Single Photon Detector is just another name for them? Link to comment Share on other sites More sharing options...
Premium Member Phil Rhodes Posted August 3, 2004 Premium Member Share Posted August 3, 2004 Hi, Okay, but they do generally detect a lot more than one photon! And yes, there's one for every pixel. Yes, that's a lot. They lose a lot in manufacturing due to defects - and it's accepted that most CCDs have defects which are mapped out in the electronics. You may have encountered the irritating dead pixel situation with LCD monitors. Phil Link to comment Share on other sites More sharing options...
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