CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation Gernot Hoffmann The Digital Munsell 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 CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation Contents Used Hues by Used Neutrals name and angle Step dV= . Introduction 2 The Munsell nomenclature is interpreted Step dH=9° 2. Planes of constant Munsell Hue 3 - 4 for instance like this: N=0,1,...9,10 3. Planes of constant Munsell Value in CIELab 43- 44 0R 5/8 means H=8°, V=5 and C=8. Added N=0 and 2.5R 351 N=10 4. References 45 The Munsell Hue is defined by a name. 5R 0 The table contains the assigned angle 7.5R 9 Unused Introduction 10R 18 in degrees. Planes of constant H are made for mul- 2.5YR 27 1.25YR 22.5 The Munsell color system was created by the artist A.H.Munsell in 905 and then tiples of 9°. Planes of constant V are 5YR 36 3.75YR 31.5 improved over the years by scientists (Munsell renotation 943). 7.5YR 45 6.25YR 40.5 made for all available hues. 10YR 54 8.75YR 49.5 The colors are arranged so, that the perceptual difference between two neighbours Values V reach here from 0 to 0, in- is constant, concerning the hue (M. Hue or H in degrees), the lightness (M.Value V) cluding the ideal absorber and the ideal 2.5Y 63 1.25Y 58.5 and eventually the chroma (M.Chroma C). Good descriptions can be found in text diffuser. 5Y 72 3.75Y 67.5 books [],[2], [3], [5] and in the publication [9]. 7.5Y 81 6.25Y 76.5 Chroma C is usually shown by steps 10Y 90 8.75Y 85.5 Munsell samples are available as chips [29]. The perceptual balance requires viewing of 2 (2 steps C should be perceptually under light similar to illuminant C [6]. Such an illumination is hardly anywhere found equivalent to step V). 2.5GY 99 1.25GY 94.5 outside laboratories. 5GY 108 3.75GY 103.5 Available data with C= are ignored. 7.5GY 117 6.25GY 112.5 This document The Digital Munsell is based on the appearance of glossy Munsell Each page for a plane of constant H 10GY 126 8.75GY 121.5 chips under illumination D50. Light booths for D50 are available, either with fluorescent contains in fact two hues: tubes or with Solux tungsten halogen bulbs [26]. There was no attempt to simulate 2.5G 135 1.25G 130.5 H and H2 = H+80°. 5G 144 3.75G 139.5 the original appearance under illuminant C . Each page has a partner page which 7.5G 153 6.25G 148.5 10G 162 8.75G 157.5 The author is most grateful to Roger Breton for interesting discussions, for supplying contains CIELab values L*,a*,b* and CIELab reference data (originally from X-Rite's ColorMunki) and for measured data. gamma encoded values R,G,B for sRGB 2.5BG 171 1.25PB 238.5 Reference data for some colors were missing. The gaps could be filled by Roger's (written without apostroph) . 5BG 180 3.75PB 247.5 measured data (under D50) for the complete set. The lightness of the Neutrals in 7.5BG 189 6.25PB 256.5 If a color is out-of-gamut for sRGB, then 10BG 198 8.75PB 265.5 ColorMunki [30] was too large. The CIELab data were replaced by Roger's measured the estimated out-of-gamut distance is data. One totally wrong set 2.5B_6/0 was ignored. 2.5B 207 1.25RP 310.5 indicated bottom right in CIELab units. 5B 216 Data sets from the Munsell Color Science Laboratory [8] cannot be used, because 3.75RP 319.5 If a color is out-of-gamut for the specified 7.5B 225 6.25RP 328.5 they are valid for illuminant C. There are two versions: the real Munsells and the 10B 234 CMYK space, which is at present ISO- 8.75RP 337.5 extrapolated Munsells. Real Munsell chromas are not larger than 6, whereas ex- Coated_v2_eci.icc, then the estimated trapolated Munsells can have chromas almost double as large. This is important for 2.5PB 243 1.25R 346.5 distance is indicated bottom left in each 5PB 252 3.75R 355.5 understanding some illustrations in [9] and for the interpretation of data in []. field. 7.5PB 261 6.25R 4.5 10PB 270 8.75R 13.5 This doc shows a subset of about 600 real Munsell colors, as existing in chip sets. The underlying algorithms are described It can be printed by a PostScript printer. All colors patches are programmed by CIE- in [24]. 2.5P 279 Patched by Lab numbers. 5P 288 Planes of constant V in CIELab contain 7.5P 297 measured data The printer should work in PostScript mode ‚Archive Format‘ instead of ‚Optimized gamut boundaries for sRGB and for 10P 306 for speed‘. Otherwise some elements might get lost. the CMYK space. The lightness L* was 10YR 5/2 Some printers cannot reproduce CIELab correctly. In such a case the CIELab values 2.5RP 315 10YR 5/4 calculated as mean value of all colors in 5RP 324 10B 2/4 in the PDF should be converted by Acrobat Professional into ProPhotoRGB, and the each diagram. 7.5RP 333 7.5Y 8/10 printer should use this wide gamut space as input space. 10RP 342 5P 5/10 2 CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation 80o 5BG 5R 0o 0 V 9 8 6 5 4 3 2 0 6 C 4 2 0 8 6 4 2 2 4 6 8 0 2 4 C 6 3 CIELab Document / Rendering Intent Relative Colorimetric / With Blackpoint Compensation o o Lab RGB 80 5BG 00 255 5R 0 0 0 255 0 255 0 V 0 Lab RGB Lab RGB Lab RGB 9.9 202 9.3 229 92. 249 - 3.8 240 -0.3 9 230 .6 22 -0.8 232 0.2 230 3.8 225 4 0 0 0 0 0 Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB 8. 49 8. 6 8.4 20 8.4 220 82.3 242 8.8 255 -2 3.2 24 - 2.6 20 -0.5 8 202 8. 9 .9 92 28.0 83 -2. 204 -0. 204 -0.3 203 4.3 95 9.4 88 5.0 3 0 0 0 0 0 0 0 0 0 5 2 Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB . 3 .5 96 2. 26 2.0 50 .4 3 2. 96 .8 23 2.0 230 2.4 245 2.5 255 -4 2.6 95 -3 .2 9 -2 2.3 89 - 2.4 83 -0.6 5 9.0 8.3 64 2.3 5 35.6 5 46.3 4 -6.0 83 -4.4 82 -2.6 8 -.3 8 -0.3 5 4.3 69 9.2 60 4.5 5 8.6 46 24.0 3 8 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 4 0 6 4 Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB 62.0 0 60. 0 6.6 59 60. 92 6.2 24 6.2 48 6.9 69 6. 84 6.9 20 62. 2 63.2 233 63. 248 -5 3.3 4 -4 3.5 6 -3 2. 65 -2 3. 5 - .4 54 0. 6 48 9.6 43 8.2 3 2.9 30 3.3 22 45.4 55.8 05 -9.6 65 -. 58 -5.4 5 -2.8 49 -. 49 -0. 48 4. 42 8.8 35 4. 26 20.0 25.6 29.8 04 4 0 6 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 3 0 Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB 5.2 0 50.5 0 5.2 2 5.0 5 5.3 02 5.2 2 5. 4 5.6 58 52.2 6 52.3 90 52.6 204 53.0 29 53.4 229 -4 8.8 43 -4 2.2 39 -3 2. 3 -2 0.5 32 -9.9 2 -0.5 5 22 9.3 9.5 0 29.4 04 39.0 95 48.0 86 58.0 3 64.4 63 - 0.3 38 -8. 34 -5.8 3 -3.5 2 -.5 24 -0.2 22 4.4 6 9. 0 4.6 0 9. 93 25.2 86 30.2 9 35.9 0 6 0 9 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB Lab RGB 40.8 0 40.8 0 40.5 4 40.8 40.9 9 4.6 9 4.5 34 4.6 48 4.9 62 42.0 5 43.2 89 42.5 98 -4 3.9 4 -3 .9 0 -2 2.2 06 -9.