What Is Chrominance?

Chroma.

[sè dù]

Chroma.

Color is represented by lightness and chromaticity. Chromaness is the property of a color that does not include lightness. It reflects the hue and saturation of a color. ^[1]

The perception of color by the human visual system is

Topic content and scope

This standard specifies two methods for determining color. This standard measures the color of the sample after 15 minutes of clarification.

This standard is proposed by the Standards Division of the State Environmental Protection Agency.

This standard was drafted by China Textile University.

The main drafters of this standard are Tan Danli and Chen Jihua.

This standard entrusts China National Environmental Monitoring Station to be responsible for interpretation.

Chroma is a sensory indicator. Generally pure natural water is clear and transparent, that is, colorless. However, sewage with colored pollutants such as metal compounds or organic compounds has various colors. The colored sewage is diluted with distilled water and compared with the reference water sample, and it is diluted until the color difference of the second water sample is the same.