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===IPT===
Ebner and Fairchild addressed the issue of non-constant lines of hue in their color space dubbed ''IPT''<ref>
{{Citation
| last1 = Ebner
| last2 = Fairchild
| title = Development and Testing of a Color Space with Improved Hue Uniformity
| series = Proc. IS&T 6th Color Imaging Conference
| place = Scottsdale, AZ
| pages = 8-13.
| year = 1998
}}
</ref>. The IPT color space converts [[D65]]-adapted [[XYZ]] data (XD65, YD65, ZD65) to long-medium-short cone response data (LMS) using an adapted form of the Hunt-Pointer-Estevez matrix (MHPE(D65))<ref>
{{cite web
| last = Edge
| first = Christopher
| title = US Patent 8,437,053, Gamut mapping using hue-preserving color space
| url = http://http://www.google.com/patents/US8437053
| access-date = 9 February 2016
}}
</ref>.
The IPT color appearance model excels at providing a formulation for hue where a constant hue value equals a constant perceived hue independent of the values of lightness and chroma (which is the general ideal for any color appearance model, but hard to achieve). It is therefore well-suited for [[Color management#Gamut mapping|gamut mapping]] implementations.
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