Which standard measures the reddishness or bluishness of white light?

The correct answer, color temperature, is a measure that quantifies the color characteristics of light, particularly in assessing how "warm" or "cool" a light source appears. It is expressed in degrees Kelvin (K). Lower values represent warmer light with reddish tones, while higher values indicate cooler light with bluish tones. For instance, a color temperature around 2700K is often associated with warm, yellowish light (like that from incandescent bulbs), while light sources in the range of 5000K to 6500K appear much cooler, resembling daylight.

Understanding color temperature is essential in various fields such as photography, filmmaking, and lighting design because it helps in achieving the desired look and feel of an image or scene. Properly setting the color temperature can influence the mood and perception of visuals, making it a critical concept in AVTF practices.

In contrast, color filters are used to selectively alter the wavelengths of light that pass through, light intensity refers to the brightness level of a light source, and color balance is concerned with adjusting the intensity of various colors within an image to achieve a neutral or desired overall appearance but does not inherently measure temperature.