ISO 5
Encyclopedia
ISO 5 is an international standard
International standard
International standards are standards developed by international standards organizations. International standards are available for consideration and use, worldwide...

 for density measurements in photography
Photography
Photography is the art, science and practice of creating durable images by recording light or other electromagnetic radiation, either electronically by means of an image sensor or chemically by means of a light-sensitive material such as photographic film...

 and graphic technology.
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