Which of the following is NOT a function of a color filter?

A color filter is designed primarily to manipulate specific aspects of light, particularly color and wavelength. Among its functions, a color filter can change the color of the light by allowing only certain wavelengths to pass while blocking others. This selective transmission results in the alteration of the perceived color of the source light.

Blocking certain wavelengths is a fundamental function of color filters; they are specifically created to absorb or reflect particular wavelengths of light, allowing for the desired colors to emerge while excluding unwanted ones.

Mixing colors of light typically involves combining different light sources or filters to create a new color. While color filters can be part of this process, they do not inherently mix colors in the same way that blending pigments does.

Adjusting the intensity of light is not a primary function of a color filter. While a filter may inherently change the perceived intensity of light by only allowing certain wavelengths to pass, its main role is not to adjust intensity but rather to filter colors. Therefore, the function that does not align with the primary roles of a color filter is adjusting the intensity of light.