# hexachromatic
## English
### Etymology

From hexa- +‎ chromatic.

### Adjective

hexachromatic (not comparable)
* Able to distinguish six distinct colors.
** 1901, Archives of Ophthalmology, page 325:He considers that color is conveyed to the mind through a perceptive centre, and that this centre is only able to distinguish six definite points of difference (colors) in the spectrum. Therefore, for normal sight, he holds a hexachromatic theory of color-vision which is independent of light and shade.
** 1916, George Lindsay Johnson, Photography in Colours, 3rd (revised) edition, London: George Routledge & Sons, Ltd.; New York, N.Y.: E. P. Dutton & Co., page 52:Dr. Edridge-Green has classified colour-blind people according to whether they can perceive sis colours, five, four, three, two, or only one colour. Thus, one who distinguishes all six colours, or a hexachromatic person, may be considered as normal.
** 1917, The Cambridge Magazine, page 374:It is worth noting that in 1891 Dr. Edridge-Green, of St. John’s College, put forward the view, in his Colour Blindness, p. 103, that whereas normal vision is hexachromatic, there are persons who emphatically distinguish seven colours in the spectrum, exactly as did Newton—or rather the assistant on whom Newton always relied.
** 1927 June, C. K. Ogden, “Science Notes”, in The Forum, volume LXXVII, number 6, illustrated section, page XLII:Most of us, they assert, are “hexachromatic”. We see red, orange, yellow, green, blue, and violet.
** 1966, Kai von Fieandt, The World of Perception, The Dorsey Press, page 103:“Hexachromats” have normal color vision apart from their difficulty in discriminating indigo. “Heptachromats” are faultless color perceivers. The “hexachromatic” category is assumed to be the largest.
** 1991 March 26, Mickey Rowe, “Primary colors in human color vision”, in sci.bio (Usenet):I think that some turtles potentially have hexachromatic vision due to different matches between expressed pigment and associated oil droplet!
* Having six independent channels or dimensions for characterizing color information.
** 1894 April 30, Journal of the Society of Chemical Industry, page 310:The scale contains 493 separate sensations, which are structurally hexachromatic and visually colourless.
** 1970, Tom N. Cornsweet, Visual Perception, Academic Press, page 198:If a subject with normal (trichromatic) color vision wears the glasses in Fig. 8.24, his vision will be hexachromatic (six-color).
** 1971, F. E. Round, M. Hickman, “Phytobenthos sampling and estimation of primary production”, in N. A. Holme, A. D. McIntyre, editors, Methods for the Study of Marine Benthos (IBP Handbook; number 16), Oxford, Edinburgh: Blackwell Scientific Publications, →ISBN, pages 182–183:As Moss (1967b) says, meaningful estimations of chlorophylls b and c in the presence of their pheophytins will be achieved by either extending the trichromatic method to a hexachromatic one, in which pheophytins, as well as chlorophylls are estimated, or by using separation methods such as that devised by Parsons (1963) for chlorophyll c.
** 1997, Albert Saijo, Outspeaks: A Rhapsody, Bamboo Ridge Press, →ISBN, page 153:I WANT TO GO TO AT LEAST HEXACHROMATIC VISION WHERE AIR BECOMES SO TEXTURED I CAN MOUNT IT LIKE A BIRD — I WANT TO PIONEER THIS GOLDEN AGE OF HEXACHROMATIC VISION
** 2000, Innes C. Cuthill, Julian C. Partridge, Andrew T. D. Bennett, Stuart C. Church, Nathan S. Hart, Sarah Hunt, “Ultraviolet Vision in Birds”, in Advances in the Study of Behavior, volume 29, Academic Press, →ISBN, page 175:The presence of six types of retinal cones confers the potential for hexachromatic (six-dimensional) color space but, as previously shown, if only the single cones are involved then tetrachromacy is more likely.
** 2003 June 13, John Wilkins, “To John Harshman: Kinds Continued”, in talk.origins (Usenet):The RGB system has a wider scope than the CMYK one. It can, errr, *display* taxa that the CMYK cannot. Now, a hexachromatic system can display far *more*...
** 2004 September 16, Mohamed Al-Dabbagh, “Assign vs. convert to profile”, in comp.graphics.apps.photoshop (Usenet):CMYKOG (Cyan-Magenta-Yellow-blacK-Orange-Green) and CMYKLcLm (Cyan-Magenta-Yellow-blacK-Light cyan-Light magenta) are two spaces of hexachromatic nature (i.e. six colors process).
** 2009 July 16, BGB / cr88192, “New release of the Dynace OO extension to C”, in comp.lang.c (Usenet):actually, this reminds me of an idea I had a while ago, mostly for the image-transforms for a hypothetical piece of hardware, where each "pixel" would consist of: a origin (XYZ, local space); a normal vector (also local space); an RGBA value for each pixel (or maybe RGBA-IUV, or a hexachromatic system).
** 2012, Kentaro Arikawa, “Color sensors of butterflies”, in Friedrich G. Barth, Joseph A. C. Humphrey, Mandyam V[eerambudi] Srinivasan, editors, Frontiers in Sensing: From Biology to Engineering, SpringerWienNewYork, page 51:Given that Papilio butterflies have six classes of spectral receptors in the retina, is their color vision hexachromatic?
** 2017, Natalie K. Gordon, Richard Gordon, Embryogenesis Explained, World Scientific, page 295:In theory, a rare women could even have hexachromatic vision but there is no evidence of that having ever occurred because we simply don’t test beyond tetrachromacy.
* Composed of or based on six colors.
** 1998 June 23, Salvatore Denaro, “Next purchase a mistake”, in comp.sys.next.advocacy (Usenet):> Apple Customers aren't the market that WebObjects is trying to / >get.. The market that WebObjects is aimed at is the market that hates / >Apple. / This is 100% true. I am shocked at the hostility that a little bit of hexachromatic fruit can inspire.
** 1999 September 29, Liquid Tensions, “How sad it is”, in alt.music.dream-theater (Usenet):I STILL get to heard the full album, my copy will STILL arrive through the door in it's bright shiny blister pack with it's glossy front cover that's been printed on a hexachromatic Heidelberg or Itek AB Dick press - it's STILL the same thing.
** 2003, The Fundamentals of Creative Design, AVA Publishing, →ISBN, page 155:Hexachromatic printing (six colours compared to the four colours of the standard four-colour process) is becoming more widely available from printers extending the range of colours that designers can use without the need for special spot colours.
** 2004, Alistair Dabbs, Alastair Campbell, editors, The Digital Designer’s Bible: The Ultimate Route Map to Stress-free Best Working Practice for Print and Web Designers, Ilex, →ISBN, page 22:Some digital presses can print special colours, or use PMS (PANTONE Matching System) colours to provide hexachromatic enhancement of images.
** 2008, Gavin Ambrose, Paul Harris, The Production Manual: A Graphic Design Handbook, AVA Publishing, →ISBN, page 71:Printing technology continues to expand the boundaries of colour reproduction, as developments such as six-colour hexachromatic printing push the colour gamut to new dimensions.
* Having six different pitch classes
** 1993, John H. Chalmers, Jr., Divisions of the Tetrachord: A Prolegomenon to the Construction of Musical Scales, →ISBN, page 149:These divisors generate what may be called pentachromatic, pentenharmonic, hexachromatic, and hexenharmonic genera.
** 2004, Ján Haluška, The Mathematical Theory of Tone Systems, Marcel Dekker, →ISBN, page 338:RAT(HYPOD/HEX)-7; 1+1 Rationalized hexachromatic/hexenharmonic genus derived from K. S. ’Bastard’; 48/47, 24/23, 4/3, 16/11, 96/65, 3/2, 2 / RAT(HYPOD/HEX/NO.2)-7; 1+2 RAT. hexachromatic/hexenharmonic genus derived from K.S.’s ’Bastard’ Hypodorian; 48/47, 16/15, 4/3, 16/11, 96/65, 32/21, 2 / RAT(HYPOD/HEX/NO.3)-7; 1+3 RAT. hexachromatic/hexenharmonic genus from K.S.’s ’Bastard’ Hypodorian; 48/47, 12/11, 4/3, 16/11, 96/65, 48/31, 2 / RAT(HYPOD/HEX/NO.4)-7; 1+4 RAT. hexachromatic/hexenharmonic genus from K.S.’s ’Bastard’ Hypodorian; 48/47, 48/43, 4/3, 16/11, 96/65, 96/61, 2