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Kodak Portra
Kodak Portra is a family of daylight-balanced professional colour negative films made mainly for portrait and wedding applications. The films are available in three speeds — 160, 400, and 800 ISO — with the 160 and 400 speed formerly available as "natural color" (NC) and "vivid color" (VC) varieties before the 2011 update.
The film has been upgraded by newer versions several times in the last few years to improve grain and scanning performance.
==2010 Portra 400 Upgrade==
Kodak introduced a new version of the Portra 400 film which replaced the NC and VC versions in late 2010. The new film incorporates a number of technological advances from the Kodak Vision line of motion pictures films. Kodak lists finer grain, improved sharpness over 400 NC and naturally rendered skin tones as some of the improvements over the existing NC and VC line.〔(【引用サイトリンク】 url=http://www.kodak.com/global/en/professional/products/films/portra/400QA.jhtml?pq-path=2300875 )〕
Kodak also lists improved scanning performance as a feature, but the film still retains an orange mask for optical printing. The "NC" and "VC" varieties of the film were introduced to address the need for different levels of contrast and color saturation when printing, and adjusting these image attributes tend to be more difficult with traditional color darkroom printing than with digital imaging. This has influenced a decision to merge the two varieties of the film based on the assumption that most prints are currently made from digital scans which allow for these adjustments to be carried out digitally.〔(【引用サイトリンク】 url=http://www.insideanalogphoto.com/inside-analog-photo-radio-scott-disabato-3/551 )〕
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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