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You Are Here: creation process: post production: miscellaneous: Telecines
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Telecines
Primary color correcting is possible in the transfer process via this computer link. The well known names in primary color correction computers are Amiga, DaVinci, Dubner and Sunburst. For instance, if you shot tungsten balanced film outdoors without the proper filter, it could be "fixed" here. Scenes or shots from different days in which lighting differs can also be corrected. All the information used in these corrections is stored in the computer so that the same results can be duplicated later if a second transfer is desired. It is also possible to do secondary color correction in a tape-to-tape transfer.
There are two different types of telecines, the Flying Spot and the CCD.
* Flying Spot
This telecine scans the face of a long, narrow cathode ray tube (CRT) with an electron beam. It goes back and forth, up and down 60 times a second (for 60 Hertz NTSC) creating a 525 line video frame. A lens projects an image of this spot onto each continously moving film frame, superimposing 525 lines on each film image. A photo cell measures the luminance (brightness) of the spot projected through each moving film frame. A set of filters measures the chromatins (colors) for each point of the frame. These signals are combined to create the video signal. The most well known flying spot manufacturer is Rank Cintel.
Flying spot telecines are limited in their resolution are the size of the spot and the bandwidth of the machine. The smaller the spot, the better the resolution and the wider the bandwidth the better the signal.
* CCD
The CCD telecine operates much in the same way a three chip CCD camera does, with a seperate chip responsible for processing each of the primary colors. The difference is that the CCD telecine is not a full chip like the camera but a single line of micro photosensors fixed at a perpendicular angle to the direction of film travel. A tungsten halogen lamp projects a continously moving image onto the CCDs, sampling a 525 line image of Red, Green and Blue for each frame. The most common name associated with CCD telecines is Bosch.
The horizontal resolution of the CCD telecine is limited by the number of discrete pixels available.
Excerpted from: http://www.24fps.com
This article was acquired on the "fair use" basis.
We encourage You to visit the source website for more information on this topic.
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