ISO 26431-1:2008 デジタルシネマ（Dシネマ）の品質—パート1：画面の輝度レベル、色度、均一性 | ページ 2

Foreword

ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies (ISO member bodies). The work of preparing International Standards is normally carried out through ISO technical committees. Each member body interested in a subject for which a technical committee has been established has the right to be represented on that committee. International organizations, governmental and non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.

International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.

The main task of technical committees is to prepare International Standards. Draft International Standards adopted by the technical committees are circulated to the member bodies for voting. Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.

Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. ISO shall not be held responsible for identifying any or all such patent rights.

ISO 26431-1 was prepared by the Society of Motion Picture and Television Engineers (as SMPTE 431-1-2006) and was adopted, under a special"fast-track procedure", by Technical Committee ISO/TC 36, Cinematography, in parallel with its approval by the ISO member bodies.

ISO 26431 consists of the following parts, under the general title Digital cinema (D-cinema) quality.

• Part 1: Screen luminance level, chromaticity and uniformity

Introduction

This International Standard comprises SMPTE 431-1-2006 and the following informative notes.

• Informative reference: The French national standard NF S27-100, Cinematography — Electronic projection rooms of digital cinema type, provides additional regional information.
• Stray light and contrast (see Clause A.7): The reader is encouraged to review national standards and recommendations.

1 Scope

This standard specifies the absolute luminance level, white point chromaticity, and luminance uniformity of the reflected screen light for the presentation of motion pictures by projectors with digital light engines in review rooms and commercial cinemas. It is the purpose of this specification to achieve the tone scale and contrast in the projected image that will correspond to that intended during the mastering process.

2 Normative reference

The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreement based on this standard are encouraged to investigate the possibility of applying the most recent edition of the standards indicated below.