National Standard Color Image

Quick answer：

A National Standard Color Image refers to an image that adheres to the color standards established by a country's national authority. These standards ensure consistency in color representation across different applications, such as printing, digital media, and design. The Chinese National Standard for color imaging, GB/T 18830-2002, defines the colorimetric characteristics for color images and specifies the color space, colorimetric observer, and colorimetric standard illuminant for color management.