- * This is the RLAB space, normalized to D65, which means that the standard
- * D65 illuminant (x=0.31271, y=0.32902, z=1-y-x) gives L=M=S under this transformation.
- * This makes sense because sRGB (which is used to derive those XYZ values
- * in the first place) assumes the D65 illuminant, and so the D65 illuminant
- * also gives R=G=B in sRGB.
+ * CIECAM02 chromatic adaptation, while related to the transformation we want,
+ * is a more complex phenomenon that depends on factors like the viewing conditions
+ * (e.g. amount of surrounding light), and can no longer be implemented by just scaling
+ * each component in LMS space. The simpler way out is to use the HPE matrix,
+ * which is intended to be close to the actual cone response; this results in
+ * the “von Kries transformation” when we couple it with normalization in LMS space.
+ *
+ * http://www.brucelindbloom.com/index.html?Eqn_ChromAdapt.html compares
+ * von Kries transformation with using another matrix, the Bradford matrix,
+ * and generally finds that the Bradford method gives a better result,
+ * as in giving better matches with the true result (as calculated using
+ * spectral matching) when converting between various CIE illuminants.
+ * The actual perceptual differences were found to be minor, though.
+ * We use the Bradford tranformation matrix from that page, and compute the
+ * inverse ourselves. (The Bradford matrix is also used in CMCCAT97.)