1、BRITISH STANDARD BS5550-6.4: 1980 Incorporating Amendment No.1 Cinematography Part6: Television usage Section6.4 Recommendations for the density range, contrast and colour balance of films and slides for colour televisionBS5550-6.4:1980 These recommendations, having been approved by the Cinematograp
2、h Standards Committee, were published underthe authority of the Executive Board on 27 February1970 as BS4563 BSI 09-1999 The following BSI references relate to the work on these recommendations: Committee reference CMS/3 Draft for comment69/3220 ISBN 580 05577 9 Co-operating organizations The Cinema
3、tograph Standards Committee, under whose supervision these recommendations were prepared, consists of representatives from the following Government departments and scientific and industrial organizations: Association of Cinematograph Television and Allied Technicians* British Broadcasting Corporatio
4、n* British Film Institute* British Kinematograph, Sound and Television Society* British Photographic Manufacturers Association* Cinematograph Exhibitors Association of Great Britain and Ireland* Federation of Specialised Film Associations* Film Laboratory Association* Film Production Association of
5、Great Britain* Home Office Illuminating Engineering Society Incorporated Association of Kinematograph Manufacturers Limited* Independent Television Companies Association* Kinematograph Renters Society* Ministry of Defence, Army Department Royal Photographic Society The scientific and industrial orga
6、nizations marked with an asterisk in the above list, together with the following, were directly represented on the committee entrusted with the preparation of these recommendations: Association of Independent Cinemas British Society of Cinematographers Amendments issued since publication Amd. No. Da
7、te of issue Comments 2964 September 1980 Indicated by a sideline in the marginBS5550-6.4:1980 BSI 09-1999 i Contents Page Co-operating organizations Inside front cover Foreword ii 1 Scope 1 2 Density range and contrast 1 3 Colour balance 1 4 Optical viewing conditions 1BS5550-6.4:1980 ii BSI 09-1999
8、 Foreword These recommendations make reference to the following British Standards: BS1384, Measurement of photographic transmission density. BS5550-7.2.1, Screen luminance in cinematograph laboratory and studio review rooms. These recommendations have been prepared under the authority of the Cinemat
9、ograph Standards Committee as part of a programme of work relating to films for television undertaken at the request of the British Kinematograph, Sound and Television Society. It supplements BS5550-6.2, “Density and contrast range of monochrome films, slides and photographic opaques for television”
10、. The recommendations made are primarily intended for the guidance of film processing laboratories, but indirectly serve as a guide to film producers, cameramen, and those responsible for studio lighting, to assist them in producing that type of material which is best suited to the most effective tr
11、ansmission by television. Discussions regarding, the most appropriate viewing conditions for the assessment of the films are proceeding with a view to the issue of more detailed recommendations at a later date. This standard was confirmed (as BS4563) in1977. As all British Standards on cinematograph
12、y are eventually to become Sections or Subsections of BS5550, this standard has been renumbered as BS5550-6.4. BSI Sectional List1, obtainable free from the BSI Sales Department, catalogues the British Standards on cinematography. The latest edition of SL1 should be referred to particularly in view
13、of this development. A British Standard does not purport to include all the necessary provisions of a contract. Users of British Standards are responsible for their correct application. Compliance with a British Standard does not of itself confer immunity from legal obligations. Summary of pages Thi
14、s document comprises a front cover, an inside front cover, pagesi andii, page1 and a back cover. This standard has been updated (see copyright date) and may have had amendments incorporated. This will be indicated in the amendment table on the inside front cover.BS5550-6.4:1980 BSI 09-1999 1 1 Scope
15、 These recommendations relate to the density range, contrast and colour balance of colour positive films and slides for transmission by colour television, and to the optical viewing conditions for the assessment of such films and slides. NOTEThroughout this standard, the term “films” embraces “slide
16、s” also. 2 Density range and contrast For satisfactory television quality: 1) The minimum density 1)in the colour positive print for those areas where detail is to be reproduced should never be less than0.3. Any area intended to be reproduced as white should have a density not exceeding0.4. 2) Shado
17、w areas in which the reproduction of detail is not important may have densities 1)in the range of2.0 to2.5, but it must be recognized that in such areas both image gradation and colour may be distorted or lost entirely. Current experience shows that where films are made specifically for television t
18、ransmission it is desirable that they should have a contrast which is somewhat lower than that normally used for optical projection in cinemas. To ensure this, the lighting contrast in original photography must not be great. A ratio not exceeding2:1 for key light-plus-fill light to fill light only,
19、should give satisfactory rendering of faces. 3 Colour balance Both35mm and16mm colour films should be balanced for projection by an illuminant approximating in spectral distribution to a black body full radiator at a colour temperature of5400 400K. When so illuminated, neutral grey images on the fil
20、m should substantially achieve a metameric match 2)to true neutral density for the Standard Observer having the spectral sensitivity as adopted by the International Commission on Illumination,1939. Although an abnormal colour balance is not required in films intended for colour television transmissi
21、on, experience indicates that domestic viewing conditions are such that variations from the colour balance defined above are less acceptable in this form of presentation than in the darkened conditions of a cinema. 4 Optical viewing conditions A satisfactory colour film for television may appear to
22、be of a lower contrast than that conventional for optical projection in accordance with the requirements of BS5550-7.2.1 3) . Where assessment of the print by telecine is not practicable, it is recommended that viewing conditions comparable with those of domestic television viewing should be employe
23、d. 1) As defined in BS1384, “Measurement of photographic transmission density”. 2) The metameric match of two colours whose spectral compositions are different is obtained when the visual comparison of these two colours does not permit them to be distinguished. 3) BS5550-7.2.1, “Screen luminance in
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