色評価環境標準化の動向～色評価用LED照明を用いた印刷物観察条件のガイドラインとISO 3664の改定～

抄録

Since the late 2010s, office and home lighting have shifted from incandescent and fluorescent bulbs to LEDs. The color evaluation lighting used in the graphic arts industry has also shifted from fluorescent to LED; however, both national and international standards have been developed for fluorescent lamps and do not support LEDs. To solve this problem, The Japanese Society of Printing Science and Technology published the "Guidelines for Viewing Conditions for Printed Materials Using LED Lightings for Color Evaluation" in 2021. In response, several types of LEDs that comply with these guidelines have been released and are now widely used. International standard ISO 3664:2009 is based on fluorescent lamps. Therefore, to maintain consistency with the revised standard, Japan has proposed new viewing conditions that are compliant with LEDs. After several years of discussion, the proposal was approved, and the standard was published as ISO 3664:2025 in July 2025. The new viewing conditions are unique in that they do not contain ultraviolet light, which is consistent with the characteristics of LEDs. All Japanese-made color evaluation LEDs now comply with the ISO standard.