Effect of Small Color Differences in Color Vision on the Matching of Soft and Hard Proofs

The question of whether color matches between soft and hard proofs are seen as a match by all color-normal observers arises because: (1) the color matches between soft and hard proofs are metameric, and, (2) the color vision from one color-normal observer to another is not the same. This question has been addressed theoretically, and the results confirmed by color matching experiments. Matches made by one color-normal observer are acceptable to other such observers. They are not, however acceptable to people with slight color vision deficiencies (anomalous trichromats). Likewise, matches made by anomalous trichromats are not acceptable to color-normals. The D & H Color Rule is a way to identify anomalous trichromats.