GB/T 18995-2003 in English

《GB/T 18995-2003电影摄影术 在16mm、35mm和65mm电影胶片上由制造厂印制的潜影标识 规范和尺寸》由TC102（全国感光材料标准化技术委员会）归口，主管部门为中国石油和化学工业联合会。
本标准规定了16mm、35mm和65mm电影胶片上机读识别码的位置和尺寸，这些机读码是机读型的潜影检索码。本标准还规定了这些机读码的码格式和扫描器的扫描区及光谱特性，进一步规定了由制造厂任选的印制特定胶片类型识别信息所用的区域等。

Scope

This standard specifies the location and size of machine readable identification codes on 16 mm, 35 mm and 65 mm motion picture films, which are machine readable latent image retrieval codes. This standard also specifies the encoding format of these machine-readable codes and the scanning area and spectral characteristics of the scanner. 1.2 This standard also specifies the position, size and content of human-readable identification (retrieval) codes on 16mm, 35mm and 65mm motion picture film for shooting original or intermediate printing. These filmstrips also contain the machine-readable retrieval codes described in 1.1. NOTE: Typically these access codes are exposed on the film during manufacture. 1.3 This standard further specifies areas for printing of identification information for specific film types, at the option of the manufacturer. 1.4 This standard also stipulates the area on the film that is not allowed to be exposed by the film manufacturer. This area is reserved for the convenience of users to record data. 1.5 Finally, this standard specifies the optional format indicator marks for 35mm and 65mm films.