45
Glossy version Colors by Lab numbers Illuminant D50 Out-of-gamut distances for sRGB and ISOCoated Protected by Copyright Public scientific application requires permission Commercial application requires a contract October 20 / 203 Website Load Browser Click here http://docs-hoffmann.de Gernot Hoffmann The Digital Munsell

Gernot Hoffmann The Digital Munsell · Real Munsell chromas are not larger than 6, ... 10Y 90 2.5GY 99 5GY 108 7.5GY 117 10GY 126 ... 3 .3 20.0 RGB 2 22 0 0 Lab 63.2 45.4 25.6 RGB

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Page 1: Gernot Hoffmann The Digital Munsell · Real Munsell chromas are not larger than 6, ... 10Y 90 2.5GY 99 5GY 108 7.5GY 117 10GY 126 ... 3 .3 20.0 RGB 2 22 0 0 Lab 63.2 45.4 25.6 RGB

CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation

Glossy versionColors by Lab numbers

Illuminant D50

Out-of-gamut distancesfor sRGB and ISOCoated

Protected by CopyrightPublic scientific application

requires permissionCommercial application

requires a contract

October 20 / 20�3

WebsiteLoad Browser

Click herehttp://docs-hoffmann.de

Gernot HoffmannThe Digital Munsell

Page 2: Gernot Hoffmann The Digital Munsell · Real Munsell chromas are not larger than 6, ... 10Y 90 2.5GY 99 5GY 108 7.5GY 117 10GY 126 ... 3 .3 20.0 RGB 2 22 0 0 Lab 63.2 45.4 25.6 RGB

2

CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation

The Munsell color system was created by the artist A.H.Munsell in �905 and then improved over the years by scientists (Munsell renotation �943). The colors are arranged so, that the perceptual difference between two neighbours is constant, concerning the hue (M. Hue or H in degrees), the lightness (M.Value V) and eventually the chroma (M.Chroma C). Good descriptions can be found in text books [�],[2], [3], [5] and in the publication [�9]. Munsell samples are available as chips [29]. The perceptual balance requires viewing under light similar to illuminant C [6]. Such an illumination is hardly anywhere found outside laboratories.

This document The Digital Munsell is based on the appearance of glossy Munsell chips under illumination D50. Light booths for D50 are available, either with fluorescent tubes or with Solux tungsten halogen bulbs [26]. There was no attempt to simulate the original appearance under illuminant C .

The author is most grateful to Roger Breton for interesting discussions, for supplying CIELab reference data (originally from X-Rite's ColorMunki) and for measured data. Reference data for some colors were missing. The gaps could be filled by Roger's measured data (under D50) for the complete set. The lightness of the Neutrals in ColorMunki [30] was too large. The CIELab data were replaced by Roger's measured data. One totally wrong set 2.5B_6/�0 was ignored.

Data sets from the Munsell Color Science Laboratory [�8] cannot be used, because they are valid for illuminant C. There are two versions: the real Munsells and the extrapolated Munsells. Real Munsell chromas are not larger than �6, whereas ex-trapolated Munsells can have chromas almost double as large. This is important for understanding some illustrations in [�9] and for the interpretation of data in [�].

This doc shows a subset of about �600 real Munsell colors, as existing in chip sets. It can be printed by a PostScript printer. All colors patches are programmed by CIE-Lab numbers.

The printer should work in PostScript mode ‚Archive Format‘ instead of ‚Optimized for speed‘. Otherwise some elements might get lost. Some printers cannot reproduce CIELab correctly. In such a case the CIELab values in the PDF should be converted by Acrobat Professional into ProPhotoRGB, and the printer should use this wide gamut space as input space.

Contents

Introduction

�. Introduction 22. Planes of constant Munsell Hue 3 - 4�3. Planes of constant Munsell Value in CIELab 43- 444. References 45

The Munsell nomenclature is interpreted for instance like this:�0R 5/8 means H=�8°, V=5 and C=8.

The Munsell Hue is defined by a name. The table contains the assigned angle in degrees.Planes of constant H are made for mul-tiples of 9°. Planes of constant V are made for all available hues. Values V reach here from 0 to �0, in-cluding the ideal absorber and the ideal diffuser. Chroma C is usually shown by steps of 2 (2 steps C should be perceptually equivalent to � step V). Available data with C=� are ignored.

Each page for a plane of constant H contains in fact two hues: H� and H2 = H�+�80°.

Each page has a partner page which contains CIELab values L*,a*,b* and gamma encoded values R,G,B for sRGB (written without apostroph) .

If a color is out-of-gamut for sRGB, then the estimated out-of-gamut distance is indicated bottom right in CIELab units.

If a color is out-of-gamut for the specified CMYK space, which is at present ISO-Coated_v2_eci.icc, then the estimated distance is indicated bottom left in each field. The underlying algorithms are described in [24].

Planes of constant V in CIELab contain gamut boundaries for sRGB and for the CMYK space. The lightness L* was calculated as mean value of all colors in each diagram.

Used Hues by name and angle Step dH=9°

2.5R 351 5R 07.5R 9 10R 18

2.5YR 27 5YR 367.5YR 45 10YR 54

2.5Y 63 5Y 727.5Y 81 10Y 90

2.5GY 99 5GY 1087.5GY 117 10GY 126

2.5G 135 5G 1447.5G 153 10G 162

2.5BG 171 5BG 1807.5BG 189 10BG 198

2.5B 207 5B 2167.5B 225 10B 234

2.5PB 243 5PB 2527.5PB 261 10PB 270

2.5P 279 5P 2887.5P 297 10P 306

2.5RP 315 5RP 3247.5RP 333 10RP 342

Unused

1.25YR 22.53.75YR 31.56.25YR 40.58.75YR 49.5

1.25Y 58.53.75Y 67.56.25Y 76.58.75Y 85.5

1.25GY 94.5 3.75GY 103.5 6.25GY 112.5 8.75GY 121.5

1.25G 130.53.75G 139.56.25G 148.58.75G 157.5

1.25PB 238.53.75PB 247.56.25PB 256.58.75PB 265.5

1.25RP 310.53.75RP 319.56.25RP 328.58.75RP 337.5

1.25R 346.53.75R 355.56.25R 4.58.75R 13.5

Used Neutrals Step dV=� N=0,1,...9,10Added N=0 and N=10

Patched by measured data

10YR 5/210YR 5/410B 2/47.5Y 8/105P 5/10

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Page 5: Gernot Hoffmann The Digital Munsell · Real Munsell chromas are not larger than 6, ... 10Y 90 2.5GY 99 5GY 108 7.5GY 117 10GY 126 ... 3 .3 20.0 RGB 2 22 0 0 Lab 63.2 45.4 25.6 RGB

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+�00-�00

+�00

-60

Value 9

L* 9�.�

Planes of constant Value in CIELab

Gamut boundaries

BluesRGB

GrayISOCoated_v2_eci

L* was calculated asmean value

Page 45: Gernot Hoffmann The Digital Munsell · Real Munsell chromas are not larger than 6, ... 10Y 90 2.5GY 99 5GY 108 7.5GY 117 10GY 126 ... 3 .3 20.0 RGB 2 22 0 0 Lab 63.2 45.4 25.6 RGB

45

CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation

[�] G.Wyszecki + W.S.Stiles Color Science John Wiley & Sons, New York ,..., �982

[2] R.W.G.Hunt Measuring Colour Fountain Press, England, �998

[3] R.W.G.Hunt The Reproduction of Colour, Sixth edition John Wiley & Sons, Chichester, 2004

[4] E.J.Giorgianni + Th.E.Madden Digital Color Management Addison-Wesley, Reading Massachusetts ,..., �998

[5] R.S.Berns Billmeyer and Saltzman‘s Principles of Color Technology, Third edition John Wiley & Sons, New York ,..., 2000

[6] M.D.Fairchild Color Appearance Models, Second Edition John Wiley & Sons, Chichester, 2005

[�] H.R.Kang Computational Color Technology SPIE Press, Bellingham, 2006

[8] J.Morovič Color Gamut Mapping John Wiley & Sons, Ltd, Chichester, 2008

[9] J.D.Foley + A.van Dam + St.K.Feiner + J.F.Hughes Computer Graphics Addison-Wesley, Reading Massachusetts,...,�993

[�0] C.H.Chen + L.F.Pau + P.S.P.Wang Handbook of Pattern recognition and Computer Vision World Scientific, Singapore, ..., �995

[��] M.Stokes + M.Anderson + S.Chandrasekar + R.Motta A Standard Default Color Space for the Internet - sRGB http://www.w3.org/graphics/color/sRGB.html �996

[�2] M.Nielsen + M.Stokes The Creation of the sRGB ICC Profile Year unknown, after �998 http://www.srgb.com/c55.pdf (dead link) Search by title or use this link http://tinyurl.com/d�kwym

[�3] International Color Consortium http://www.color.org [�4] Specification ICC.�:2004-�0 http://www.color.org/icc_specs2.xalter

[�5] European Color Initiative: Offset profiles http://www.eci.org/doku.php?id=en:start

[�6] ICC Profile Inspector http://www.color.org/profileinspector.xalter

[��] Adobe System‘s Implementation of Black Point Compensation http://www.color.org/AdobeBPC.pdf

[�8] Munsell Color Science Laboratory http://www.cis.rit.edu/mcsl/online/munsell.php

[�9] Adobe Systems: The Munsell Color System http://web.archive.org/web/200308�3092028/www.adobe.com/support/techguides/color/ colormodels/munsell.html Use short URL: http://tinyurl.com/dg9ixx

[20] G.Hoffmann CIE (�93�) Color Space http://docs-hoffmann.de/ciexyz29082000.pdf

[2�] G.Hoffmann CIELab Color Space http://docs-hoffmann.de/cielab03022003.pdf

[22] G.Hoffmann Sphere Tessellation by Icosahedron Subdivision http://docs-hoffmann.de/ikos2�042002.pdf

[23] G.Hoffmann Color Management by ICC Profiles http://docs-hoffmann.de/cmsicc08�02003.pdf

[24] G.Hoffmann Gamut Visualizations and Out-of-gamut Distances http://docs-hoffmann.de/gamshow�5052009.pdf

[25] G.Hoffmann PostScript Tutor http://docs-hoffmann.de/pstutor22��2002.pdf

[26] G.Hoffmann Spot Swatch Book http://docs-hoffmann.de/swatch�6032005.pdf

[2�] G.Hoffmann Spectra for Proofing Light http://docs-hoffmann.de/prooflight�8092003.pdf

[28] Everything about Color and Computers http://www.efg2.com

[29] X-Rite Munsell products http://www.xrite.co.uk/top_munsell.aspx

[30] X-Rite ColorMunki http://www.colormunki.com/munsell

This doc: http://docs-hoffmann.de/munsell�5052009.pdf For Rendering Intent Absolute Colorimetric / No Blackpoint Compensation use: http://docs-hoffmann.de/munsell�5052009-AbsCol-NoBPC.pdf

References