Seminar on Documentation and Database Compilation of Cultural Properties – Session 1: Digital Image Basics – the Series on “Digital Image Compression from the Basics of Images to Moving Images”

Lecture on digital image formats by Dr. Imaizumi

 The documentation of cultural properties is indispensable for acquiring information about cultural properties such as their materials, forms, and colors, and for utilizing the collected information for research activities and preservation/restoration planning. The Cultural Properties Information Section of the Department of Art Research, Archives and Information Systems is responsible for communicating information about database compilation necessary for cultural property photographing in the course of documentation as well as data management/utilization. As part of the communication strategy, we held the seminar named in the title above in a seminar room at Tokyo National Research Institute for Cultural Properties on December 23rd, 2020 (COVID-19 infection control measures were taken).
 We are scheduled to hold three sessions in total in the series on “Digital Image Compression from the Basics of Images to Moving Images,” and the program designed for participants to learn the basics about image compression was offered at the first session. As the first speaker, Dr. IMAIZUMI Shoko, Associate Professor of Graduate School of Engineering, Chiba University explained about the characteristics of digital images such as differences from analog images, file properties, and the amount of information that changes depending on the resolution. Her lecture was followed by a talk by Mr. SHIRONO Seiji, an artificer of the Department of Art Research, Archives and Information Systems which mainly discussed how to control light and color when taking a digital photo such as the spectral feature that varies depending on the light source, and the light sources and their appropriate placement for photographing cultural properties.
 Currently, compressed image formats such as JPEG and MPEG-4 are commonly used around the world. However, when planning to photograph cultural properties or saving images in files, one may wonder which information will be lost due to image compression, or if everything will really be okay as long as images are saved in TIFF or RAW formats.
Through the seminars in this series, we will continue to communicate the information that will be useful for you to document and preserve cultural properties using imaging technologies and disseminate information about them.

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