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I've read the Color Survey Results. There is a sentence:

Indigo was totally just added to the rainbow so it would have 7 colors and make that “ROY G. BIV” acronym work, just like you always suspected. It should really be ROY GBP, with maybe a C or T thrown in there between G and B depending on how the spectrum was converted to RGB.

What does it mean? I understood this acronym but why C or T? I translate this article into Russian, but do not understand the meaning letters C and T here. And why between G and B?

It really should be ROY GBP?

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closed as off topic by coleopterist, Carlo_R., Barrie England, choster, simchona Dec 23 '12 at 8:44

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This question really has nothing to do with English. Marking as off-topic. That said, I expect C and T are two colours that fit in between Green (G) and Blue (B) that the writer expects could have been added instead of indigo. –  coleopterist Dec 23 '12 at 6:44
C = cyan, probably. –  MετάEd Dec 23 '12 at 6:45

1 Answer 1

up vote 4 down vote accepted

Where “ROY G. BIV” stands for {Red Orange Yellow Green Blue Indigo Violet}, the acronym “ROY GBP” would stand for {Red Orange Yellow Green Blue Purple}. The phrase “C or T thrown in there between G and B” stands for “Cyan or Teal thrown in there between Green and Blue”, because (as seen in following diagram, taken from the color survey results link in the question) teal and cyan are the colors between green and blue. (Cyan is marked as the light bluish color in the top right corner of diagram.)

enter image description here

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Pity you cannot represent spectral violet that way: it lies outside your RGB coordinates, and can only be shown as a red–blue metamere. Really, purple is only violet to people who don’t know color very much. –  tchrist Dec 23 '12 at 14:18
The split completely arbitrary and was only made into 7 to fit mystical/religous meanings of the number 7 –  mgb Dec 23 '12 at 16:41
@tchrist, yes, I thought about mentioning ROY GBP's purple anomaly. Calling purple a metamere had not occurred to me – and perhaps still hasn't :) –  jwpat7 Dec 23 '12 at 16:41
Purple is non-spectral, but the idea of ROY G BIV is to create a spectral progression. You have to use purple in an RGB system to mock up violet, because violet is below blue. –  tchrist Dec 23 '12 at 19:34

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