Abstract
The idea that “rod colour” is blue under photopic conditions is used to account for discrepancies caused by rods in large field colour matching. Discrepancies are accounted for when luminance level is changed, when a matching stimulus is altered in colour and when field trials are undertaken. Because of this rod intrusion, trichromatic matches are often not suitable for an additive system of large field colorimetry: a matching technique suited to such a system is discussed. An enquiry into why “rod colour” should be blue, together with an examination of the similarities and dissimilarities of rods and “blue cones”, leads to the further suggestion that rods and “blue cones” exist separately but share a neural pathway. Following up this idea leads to a new suggestion regarding the origin of Maxwell's spot.
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