Motion picture film scanner

A motion picture film scanner is a device used in digital filmmaking to scan original film for storage as high-resolution digital intermediate files.[1]

Film scanner at EYE Film Institute Netherlands, 2014

A film scanner scans original film stock: negative or positive print or reversal/IP. Units may scan gauges from 8 mm to 70 mm (8 mm, Super 8, 9.5 mm, 16 mm, Super 16, 35 mm, Super 35, 65 mm and 70 mm) with very high resolution scanning at 2K, 4K, 8K, or 16K resolutions. (2K is approximately 2048×1080 pixels and 4K is approximately 4096×2160 pixels).[1]

Some models of film scanner are intermittent pull-down film scanners which scan each frame individually, locked down in a pin-registered film gate, taking roughly a second per frame. Continuous-scan film scanners, where the film frames are scanned as the film is continuously moved past the imaging pick up device, are typically evolved from earlier telecine mechanisms, and can act as such at lower resolutions.[1]

The scanner scans the film frames into a file sequence (using high-end Computer data storage devices), whose single file contains a digital scan of each still frame; the preferred image file format used as output are usually Cineon, DPX or TIFF, because they can store color information as raw data, preserving the optical characteristics of the film stock. These systems take a lot of storage area network (SAN) disk space. The files can be played back one after each other on high-end workstation non-linear editing system (NLE) or a virtual telecine systems. The playback is at the normal rate of 24 frames per second (or original projection frame rate of: 25, 30 or other speeds). Each year hard disks get larger and are able to hold more hours of movies on SAN systems. The challenge is to archive this massive amount of data on to data storage devices.[1] The scanned footage is edited and composited on work stations then mastered back on film, see film out and digital intermediate. Scanned film frames may also be used in digital film restoration. The film may also be projected directly on a digital projector in the theater. The data film files may be converted to SDTV (NTSC or PAL) video TV systems.[1][2] Film recorders are the opposite of film scanners, copying content from a computer system onto film stock, for preservation or for display using film projectors. Telecines are similar to film scanners.

Imaging device
Splitting a film image into three colours in a Spirit DataCine scanning machine, 2006

Image processing
  • The three color signals (RGB) are electronically processed and color graded. A 3D look up table (3D LUT) is usually applied to the RGB values before it is coded into the DPX output files.
  • The DPX files are usually made output through a network port cable or an optical fiber port: HIPPI, Fibre Channel or newer systems like gigabit Ethernet. A computer then stores the files on to hard drives of a storage area network for later processing and use.[1]
  • Modern motion picture film scanners many have an option for an infrared CCD channel for dirt mapping, that can be used to automatically or in post manually remove dirt-dust spots on the film. The IR camera channel can be used with IR dirt and scratch removal system or made output on a four IR channel for downstream dirt and dirt and scratch removal systems. Popular downstream dirt and dirt and scratch removal systems are PF Clean and Digital ICE.[3][4][5]
  • HDR or high dynamic range is new system using a compositing and tone-mapping of images to extend the dynamic range beyond the native capability of the capturing device. This may be done by using a triple exposure for the film and then compositing the three back together. Compositing can be done in a workstation in none real time or in the scanner in real time.[6][7]

Models
  • Single frame intermittent pull-down:[1]
    • Kodak's Cineon, the first system designed for DI work, included a scanner, tapes drives, workstations and a film recorder.[8][9][10]
    • Lasergraphics - The Director 2K/4K, 19 frames per second
    • ARRI scanner, Arriscan
    • Filmlight - Northlight Film scanning, single frame intermittent scanner
    • Imagica scanner, single frame intermittent scanner.
    • Cintel's diTTo
  • Continuous motion scanning:
    • Walde - FilmStar 4K UHD 2K @ 25fps, 4K UHD @ 6fps. 35mm/16mm/8mm archive quality, continuous motion capstan driven.
    • MWA Nova Vario series with patented laser-based, sprocket and claw free transport for 16/35mm for realtime (24/25fps) scanning with sensors for either 2K+ 2236 x 1752, or 2.5K+ HDR High Dynamic Range at 2560 x 2160, direct optical and magnetic sound on and 16 and 35mm.
    • MWA Nova Choice 2K+ patented laser-based, sprocket and claw free transport for 8/Super8, 9.5mm, 16mm realtime (24/25fps) scanning w at 2K+, 2236 x 1752 with direct optical and magnetic sound on 16mm, magnetic from main and balance stripes on 8, Super8. Faster than real time scanning at lower resolution.
    • Lasergraphics - ScanStation 2K, 60+ frames per second
    • GE4 - Golden Eye Four - Filmscanner, 38 Mega Pixel camera. LED light source and continuous film transport using Capstan. From Digital Vision.
    • P+S Technik - SteadyFrame Universal Format Film Scanner
    • Cintel's C-Reality/DSX and ITK - Millennium/dataMill.
    • Spirit DataCine - SDC2000 with data option, DFT Digital Film Technology (1920 pixels in realtime at 4 frame/s) (can be switched to telecine mode)[11][12][13]
    • Spirit DataCine 4K/2K with the data option, DFT Digital Film Technology (2K realtime at 24 frame/s or 4K scans at 6 frame/s) (can be switched to telecine mode, only if it has this option)[14][15]
    • Scanity by DFT, uses continuous transport using capstan and a LED light source. Transfer speeds: 15 frame/s @ 4K, 25 frame/s @ 2K.Scanity HDR and Scanity wet-gate.[16][17][18][19][20][21][22]

See also
  • SDC-2000 Spirit DataCine Film Deck
  • Spirit Datacine 4k with the doors closed
  • Spirit Datacine 4k with the doors open.jpg
  • GCP for a Spirit Datacine
  • Scanity Film Deck
  • Cinelicious Scanity 4k and work station
  • Cintel C-Reality Film Deck
  • Filmlight's Northlight single frame film scanning unit
  • Imagica single frame film scanning unit
  • Vintage Cloud Steenbeck is the only system capable of digitizing separate image and audio at the same time at up to 4K resolution and up to 60 fps.

References
  1. COMPARISON OF SCANNING TECHNOLOGIES FOR ARCHIVAL MOTION PICTURE FILM, by Dr. Gerard Maier and Michelle S. Carlos, 2. August, 2013
  2. Patent for Processing film images for digital cinema, EP 1223765 A2
  3. PF Clean
  4. kodak.com Digital ICE
  5. DFT Scanity with infrared CCD for dust removal Archived 2009-06-18 at the Wayback Machine
  6. "Compositing Multiple Pictures of the Same Scene", by Steve Mann, in IS&T's 46th Annual Conference, Cambridge, Massachusetts, May 9–14, 1993
  7. Reinhard, Erik; Ward, Greg; Pattanaik, Sumanta; Debevec, Paul (2005). High dynamic range imaging: acquisition, display, and image-based lighting. Amsterdam: Elsevier/Morgan Kaufmann. p. 7. ISBN 978-0-12-585263-0. Images that store a depiction of the scene in a range of intensities commensurate with the scene are what we call HDR, or "radiance maps". On the other hand, we call images suitable for display with current display technology LDR.
  8. digital-intermediate.co.uk, Understanding Cineon, by Richard Patterson, First Draft 10/2/01
  9. Brucegoren.com/, Kodak Brings Digital Art to Film, by Bruce N. Goren
  10. cinematography.com, Five Scientists Earn Kudos for Developing Kodak Hybrid Technology, by Tim Tyler, February 2005
  11. Film Maker.com, THOMSON SPIRIT DATACINE, Fri, 05/04/2007
  12. thameside.tv Spirit DataCine
  13. History of Telecines Archived 2009-08-25 at the Wayback Machine
  14. "DFT Spirit 2k". Archived from the original on 2013-07-10. Retrieved 2016-11-14.
  15. DFT SDC-4k
  16. DFT's SCANITY Audio Option Datasheet
  17. Cinelicious Scanity Press release
  18. Below the Line News Magazine, Scanity, April 26, 2011
  19. Below the Line News Magazine, Scanity in Korea, October 12, 2010
  20. content-technology.com Spice Shop Thailand SCANITY, Dec 14, 2011
  21. "Scanity and Sprit Datacine in a control room". Archived from the original on 2010-12-06. Retrieved 2016-11-14.
  22. Shoot online, SHOOT Publicity Wire, OMNIMAGO Invests in SCANITY for New Production and Archive Scanning Projects, March 22, 2011
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