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Date: Thu, 31 Dec 2015 01:36:38 +1100 (EST)
From: Ian Smith <smithi@nimnet.asn.au>
To: freebsd-questions@freebsd.org
Subject: [OT] Light frequency or wavelength to (eg RGB) colour
Message-ID: <20151231012759.I8562@sola.nimnet.asn.au>
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Hi community,

does anyone know of a method - preferably a formula - for converting 
known frequencies (or complementarily, their wavelengths) within the 
visible spectrum to its colour rendition in RGB, CMYK or whatever?

cheers, Ian