A common colorimetric transformation is a homogeneous linear transformation of tristimulus values from one primary system to another. The transformation coefficients are obtained by spectrophotometry and/or visual color matching and consequently are subject to certain errors. These errors, together with those associated with the given tristimulus values, propagate into the tristimulus values to be computed by means of the transformation equations. The theory of the propagation of such errors is outlined and illustrated by an example.
GÜTER WYSZECKI, "Propagation of Errors in Colorimetric Transformations," J. Opt. Soc. Am. 49, 389-393 (1959)