This standard specifies the range of density values ​​for good color reproduction of images. This standard applies to 35mm and 16mm color film copies and slides for television use. GB/T 13154-1991 Density specification for color film copies and slides for television use GB/T13154-1991 Standard download decompression password: www.bzxz.net
This standard specifies the range of density values ​​for good color reproduction of images. This standard applies to 35mm and 16mm color film copies and slides for television use.

National Standard of the People's Republic of China
Density specifications for color motion-piclure prints and slides for television
Colour motion-piclure prints and slides for television-Density specifications GB 1315491 bzxz.net
The wide signal dynamic range of television images is much smaller than the brightness range of film projection images. When film copies are used for television broadcasting, the image's gradation and color are significantly lost, and the gradation loss in the high-density part is more serious. Corresponding density specifications are formulated for films for television to achieve the purpose of effective control.
1 Subject content and scope of application
This standard specifies the range of density values ​​for good image color reproduction. This standard applies to 35mm and 16mm color motion-piclure prints and slides for television. 2 Reference standards
GB 11500 Geometric conditions for photographic transmission density measurement GB11501 Spectral conditions for photographic density measurement 3 Density measurement
The density data in this standard are based on the standard visual diffuse transmission density, and its geometric conditions and spectral conditions shall comply with the relevant provisions of GB11500 and GB 11501.
4 Density requirements
4.1 The density value corresponding to the TV white level on the film copy should be 0.3±0.05 neutral (gray) density (including film base density). This density value can only be used as a relative calibration basis for the reproduction of detailed scenes, excluding the image density of mirror reflections and other bright details. 4.2 In order to adapt to the characteristics of the smaller dynamic range of television image signals, color film copies for broadcasting should be made of films with equivalent contrast performance, so that the high density of the shadow area on the film can be limited. The good reproduction range of tone and color of color film copies suitable for television broadcasting should be between 0.25 and 2.0. Approved by the State Bureau of Technical Supervision on September 16, 1991 and implemented on June 1, 1992
CB13154-91
Appendix A
Density control methods that can be adopted in this standard
(Supplement)
A1 The white level on the TV corresponds to the image of an object with a reflectivity of 60%-0 under full illumination in the scene. On the film copy, the density corresponding to the white level of the TV (D-0.3) to the density range of 1.1.7 is considered to be the good condition area for color reproduction.
A2 The image density of the shadow area on the color film copy for general projection is usually in the range of 12.0-2.5. When this part of the image is transferred to the TV screen, the image level and color will be distorted or even indistinguishable. The density limit of 2.0 specified in this standard is equivalent to the image density value of a black object with a reflectivity of 3 under wide-angle lighting in the scene. A3 is the density specification of the standard. Color prints for television must use a special film with a lower contrast than the film used for general color film projection.
A4 The standard visual diffuse transmittance referenced in this standard can be measured with a color densitometer that meets the following conditions, namely: the color temperature of the projected light source is 28563000K; the light receiver is a photoelectric element with a spectral response of Futai S-4 or S-9 type; and a WRATTEN 106 filter for visual measurement is provided in the receiving light path. A5 In order to effectively control the density during the printing process, it is best to insert a standard gray pole with a reflectivity of 60% and 70% (representing the basis for color balance) and 3 (used as the basis for shadow control!) and a negative film with internal wear such as human insurance in the negative film, H as a standard control film
You can also use the standard gray pole usually on the negative film The LA standard density control film used: the two-level image pattern with the corresponding user reflectivity of 10% (white) and 3% (black) is used to perform indirect index control through the method of calculating the photosensitive measurement picture: It must be noted that in the above control, the standard control film must be matched with the test surface system, and it can only be used when the image density of the two is consistent.
Appendix
Recommended magnetic videotapes directly converted from film masters for television broadcasting (reference material)
B1 Use special low-contrast color positive film to print color film for television according to the density specifications specified in this standard, which is helpful to ensure the broadcast quality of the film and minimize the distortion and color The distortion and loss of image details are of great significance. For the film copies specially ordered by the domestic television broadcasting departments for export and exchange abroad and for documentary films, typical masterpieces, etc. for long-term preservation in China, they shall all be ordered and produced in accordance with this standard:
In view of the fact that the current dedicated facilities for video conversion of television movies have the conditions for converting (film to magnetic tape) from the film master (including original film, inter-cut film, and face-to-face film) to video images with tape as the medium: and the image quality can be better than that of the special film copy, and the technical feasibility, quality assurance, and economic benefits have been verified and confirmed, it is recommended as another way of film transmission in television and should be popularized in China. The implementation principle is: the film producer provides the picture base (or picture dubbing) and mixed soundtrack (or mixed original magnetic base) in production and use, and hands them over to the designated special transcription point with complete technical facilities. The film processing and video technology department will convert the film into a finished videotape with a width of 25.4mm (1in) or 19mm (3/4in> high bandwidth for television broadcasting. Note:
GB13154
The Ministry of Radio, Film and Television of the People's Republic of China proposed this standard 91
This standard was drafted by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television. This standard was issued by the China Film Science and Technology Research Institute of the Ministry of Radio, Film and Television.
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