There are multiple synonyms for the term "dark-room filter," which refers to a colored filter that is placed above a light source in order to alter the tone and hue of a photographic print. Some common synonyms include color filter, color gel, color correction gel, and color correction filter. These terms are all used interchangeably to describe a tool used in traditional film printing to adjust the colors of an image. Another synonym is dichroic filter, which refers to filters that use interference coatings to selectively reflect certain wavelengths of light, resulting in color filtering effects. Regardless of the specific term used, a dark-room filter is an essential tool for any photographer seeking to manipulate the colors in their prints to achieve a desired aesthetic effect.