Engineering:Log profile
A log profile, or logarithmic profile, is a shooting profile, or gamma curve, found on some digital video cameras that gives a wide dynamic and tonal range, allowing more latitude to apply colour and style choices. The resulting image appears washed out, requiring color grading in post-production, but retains shadow and highlight detail that would otherwise be lost if a regular linear profile had been used that clipped shadow and highlight detail. The feature is mostly used in filmmaking and videography.
History
Log profile initially derived from Cineon film scanner, developed by Kodak in early 1990s, which uses logarithmic gamma encoding to utilize higher color bit depth (i.e. 16-bit) linear image sensor, to reproduce characteristics of negative film image. In early times of digital cinematography, professional video cameras were only capable to capture linear sensor image up to 10-bit color depth even in HDCAM-SR format, but resulted in "video-look" compared with film stock cinematography even in the same 24 frames per second and shutter speeds.
The log gamma profile began gaining industrial popularity since 2005, when Arri released Arriflex D-20 which provided original Log-C gamma through HD-SDI video output, and in 2008, Sony released CineAlta F35 camera (and its 2005 Panavision Genesis sibling) with S-Log video recording on HDCAM-SR tape. Those camera releases boosted digital cinematography deployment.
For consumer and prosumer cameras, Canon released Cinema EOS C300, which provided Canon Log video recording function, and Sony released S-Log2 profile on its Alpha 7II digital still camera, allowing low budget filmmakers to produce film-like motion pictures.
Proprietary log profiles on various cameras
- Log-C on Arri digital cameras, based on Cineon log gamma (including Log-C3 and Log-C4, not to be confused with Canon Log)
- C-Log or Canon Log on Canon cameras[1] (including C-Log2 and C-Log3)
- D-Log on DJI UAV cameras[2]
- F-Log on Fujifilm cameras[3]
- N-Log on Nikon cameras[4]
- REDlogFilm on RED cameras[5]
- S-Log on Sony cameras[6] (including S-Log2 and S-Log3)[7]
- V-Log on Panasonic cameras (including Panasonic, Panavision and Lumix cameras).
See also
References
- ↑ UK,www.canon.co.uk, Canon. "Canon Log Gamma". https://www.canon.co.uk/cameras/eos-5d-mark-iv/canon-log-gamma/. Retrieved 2018-10-07.
- ↑ "How to shoot Log video using DJI's D-Log color profile". DPReview. https://www.dpreview.com/articles/4978813437/how-to-shoot-log-video-using-dji-s-d-log-color-profile. Retrieved 2018-10-07.
- ↑ "LUT for F-Log (Look Up Table)". http://www.fujifilm.com/support/digital_cameras/software/lut/. Retrieved 2018-10-07.
- ↑ "Nikon introduces the new Nikon Z mount system, and releases two full-frame mirrorless cameras: the Nikon Z 7 and Nikon Z 6". https://www.nikon.com/news/2018/0823_mirrorless_01.htm. Retrieved 2018-10-07.
- ↑ "Understanding REDLOGFILM and REDGAMMA". https://www.red.com/red-101/redlogfilm-redgamma.
- ↑ "S-Log". https://pro.sony/en_BE/technology/s-log. Retrieved 2018-10-07.
- ↑ "What is S-Log?". https://www.sony.co.uk/electronics/support/articles/00145908. Retrieved 2018-10-07.
External links
- "A quick look at Log Gamma with DPReview.com" – video demonstrates reasons for using a log profile
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