grijsbasis

Grijsbasis, literally "gray basis" in Dutch, is a term that appears in some Dutch writings on color theory, imaging and metrology. It is not a formally standardized concept, and its exact meaning depends on the context in which it is used.

In colorimetry and display calibration, grijsbasis can refer to a neutral gray reference level used to calibrate luminance and color balance. This reference is typically a shade where the red, green and blue channels are equal, yielding a true gray.

In the context of grayscale conversion or grayscale imaging, grijsbasis may denote a basis or weighting scheme used to transform color information into grayscale. Some texts describe it as a baseline gray tone that represents midtone luminance, against which shadows and highlights are measured.

In education and documentation, grijsbasis is used as a practical shorthand to discuss neutral gray calibration targets; 18% gray or 50% gray are common reference points in photography and printing, though these values are not universal across all Dutch materials.

Because the term is not standardized, researchers and practitioners should consult the specific source to understand what grijsbasis means in that context, and clarify whether it refers to a numerical luminance target, a vector basis in a color space, or a calibration procedure.

See also: grayscale, color calibration, colorimetry, neutral gray, grayscale conversion.