38:
30:
22:
192:
730:
Color targets such as the ColorChecker can be captured by cameras and other color input devices, and the resulting images’ output can be compared to the original chart, or to reference measurements, to test the degree to which image acquisition reproduction systems and processes approximate the human
1095:. brucelindbloom.com. A page showing RGB values for color patches in various RGB color spaces, based on the applet described above, and a set of Excel spreadsheets for comparing these numbers to those in a digital camera or scanner image of the ColorChecker.
182:
mm (T). The pigments for ColorCheckerPassport were modified in
November 2014, so the current available cards do not have exactly the same carnation, and hence RGB numbers, as before, and particularly are not the ones provided on next section.
97:
The ColorChecker
Classic chart is a rectangular card measuring about 11 by 8.25 inches (27.9 by 21.0 cm), or in its original incarnation about 13 by 9 inches (33 by 23 cm), an aspect ratio approximately the same as that of
1064:. Babelcolor.com. This extensive page includes a history of the chart, average spectrophotometric measurements from 20 ColorCheckers (the precise tools used for these measurements is unclear), calculated RGB values in a variety of
731:
visual systems. It can also be used to color correct one photo with the chart in it (that may have a different color cast, for example due to a lighting coloration difference) to another "reference" photo with the chart in it.
169:
There is also a ColorCheckerPassport, a smaller version of the ColorChecker
Classic with the same 24 chips but in a tri-fold version with some additional patches on two of the pages. Its dimensions are
37:
1084:. brucelindbloom.com. Lindbloom measured the spectral reflectances his own copy of the ColorChecker, and created a Java applet to calculate colorimetric coordinates under various
89:. In 2021, X-Rite spun off its consumer-level calibration products to a separate company Calibrite, which is currently producing the ColorChecker under the Calibrite brand name.
750:
X-Rite also sells a 140-patch chart called the ColorChecker
Digital SG, and is intended for automated use with computer software to characterize digital cameras and scanners.
68:
target consisting of a cardboard-framed arrangement of 24 squares of painted samples. The ColorChecker was introduced in a 1976 paper by McCamy, Marcus, and
Davidson in the
953:
formats, taken from measurements published in Noboru Ohta (1997). "The Basis of Color
Reproduction Engineering" (Japanese). Corona-sha Company of Japan.
946:
935:
74:. The chart’s color patches have spectral reflectances intended to mimic those of natural objects such as human skin, foliage, and flowers, to have
1002:
841:
978:
924:
70:
1072:
154:
flower. The rest were chosen arbitrarily to represent a gamut "of general interest and utility for test purposes", though the
1110:
1068:, a list of places to buy charts, and advice for using the data in practical camera calibration and image applications.
1075:. Includes comparisons in CIELAB and RGB values based on spectrophotometric measurements vs. provided by Gretag–Macbeth
220:
1026:
887:
734:
Because of its wide availability and use, its careful design, and its consistency, and because comprehensive
1054:
943:
932:
1115:
738:
measurements are available, the ColorChecker has also been used in academic research into topics such as
42:
1042:
908:
216:
208:
102:. It includes 24 patches in a 4 × 6 grid, each slightly under 2 inches (5.1 cm) square, made of
993:
809:
1085:
212:
219:. Using measured reflectance spectra, it is possible to derive CIELAB coordinates for Illuminants
106:
applied to smooth paper, and surrounded by a black border. Six of the patches form a uniform gray
1092:
1081:
813:
41:
Nominal chromaticities of ColorChecker patches in the CIE 1931 xy chromaticity diagram (in the
974:
837:
831:
769:
735:
107:
79:
65:
21:
1045:
official product page at the X-Rite website for the full size, 24 patch version of the chart.
867:
1065:
774:
739:
139:
950:
939:
928:
75:
1061:
956:
921:
759:
159:
155:
111:
1048:
29:
1104:
779:
784:
764:
204:
103:
99:
78:
under a variety of lighting conditions, especially as detected by typical color
53:
45:, hover over a color swatch to highlight it; click it to select and deselect it)
138:. The remaining colors include approximations of medium light and medium dark
191:
250:
Table from Field (1990); CIE data for
Illuminant C from Poynton (2008).
1057:
official product page for the full size, 140 patch version of the chart
151:
131:
1027:"Practical Spectral Imaging Using a Color-Filter Array Digital Camera"
830:
Trémeau, Alain; Schettini, Raimondo; Tominaga, Shoji (29 July 2009).
817:
816:), which through a series of mergers and acquisitions now belongs to
135:
86:
1051:
official product page for the small, 24 patch version of the chart.
190:
163:
119:
28:
236:
147:
127:
123:
36:
789:
143:
115:
1093:"ColorChecker RGB Summaries, Spreadsheets and Lab TIFF File"
833:
Computational Color
Imaging – Alain Trémeau – Google Books
1025:
For example, Roy S. Berns and
Lawrence A. Taplin (2006).
973:, Pittsburgh, PA: Graphic Arts Technical Foundation,
931:
from the
Munsell Color Science Laboratory website in
866:
C. S. McCamy, H. Marcus, and J. G. Davidson (1976).
158:
and yellow patches are similarly colored to typical
25:
ColorChecker held in a photographic portrait setting
199:The colors of the chart were described by McCamy
888:"Some X-Rite Products Rebranding to Calibrite"
1073:"RGB coordinates of the Macbeth ColorChecker"
114:typical of chemical photographic processes –
56:(often referred to by its original name, the
8:
808:The ColorChecker was originally produced by
872:Journal of Applied Photographic Engineering
71:Journal of Applied Photographic Engineering
903:
901:
862:
860:
248:
85:In 2006, Gretag-Macbeth was acquired by
20:
1082:"How the ColorChecker Calculator Works"
801:
7:
492:Row 3: Primary and secondary colors
1008:from the original on 9 October 2012
971:Color Scanning and Imaging Systems
14:
920:Measured reflectance spectra are
1088:and in various RGB color spaces
1062:"The ColorChecker (since 1976!)"
909:"ColorChecker (‘Macbeth’) Chart"
267:Manufacturer's sRGB color values
715:
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995:ColorChecker Colorimetric Data
82:, and to be stable over time.
1:
209:CIE 1931 2° standard observer
385:Row 2: Miscellaneous colors
215:C, and also in terms of the
110:scale, and another six are
76:consistent color appearance
1132:
1055:"ColorChecker Digital SG"
868:"A Color-Rendition Chart"
598:
491:
384:
277:
146:, the front of a typical
1091:Bruce Lindbloom (2008).
1080:Bruce Lindbloom (2007).
949:21 November 2014 at the
927:10 November 2012 at the
907:Charles Poynton (2008).
599:Row 4: Grayscale colors
195:PDF version of the chart
16:Color calibration target
969:Field, Gary G. (1990),
746:ColorChecker Digital SG
207:measurements using the
1060:Danny Pascale (2009).
1043:"ColorChecker Classic"
812:(then a subsidiary of
278:Row 1: Natural colors
196:
46:
34:
26:
1111:Photography equipment
1071:Danny Pascale (2006)
1049:ColorChecker Passport
270:Reflectance Rel. MgCO
194:
54:Color Rendition Chart
40:
33:ColorChecker Passport
32:
24:
1086:standard illuminants
957:Danny Pascale’s page
938:4 March 2016 at the
217:Munsell color system
58:Macbeth ColorChecker
251:
235:and coordinates in
736:spectrophotometric
249:
197:
47:
35:
27:
843:978-3-642-03265-3
770:Color calibration
723:
722:
80:photographic film
66:color calibration
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1066:RGB color spaces
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775:Color management
740:spectral imaging
673:0.310 0.316 19.8
653:0.310 0.316 36.2
633:0.310 0.316 59.1
613:0.310 0.316 90.0
591:0.196 0.252 19.8
574:0.364 0.233 19.8
557:0.448 0.470 59.1
540:0.539 0.313 12.0
523:0.305 0.478 23.4
484:0.473 0.438 43.1
467:0.380 0.489 44.3
433:0.453 0.306 19.8
416:0.211 0.175 12.0
399:0.506 0.407 30.1
377:0.261 0.343 43.1
360:0.265 0.240 24.3
343:0.337 0.422 13.3
326:0.247 0.251 19.3
309:0.377 0.345 35.8
292:0.400 0.350 10.1
261:Munsell Notation
252:
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940:Wayback Machine
929:Wayback Machine
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713:0.310 0.316 3.1
693:0.310 0.316 9.0
506:0.187 0.129 6.1
503:7.5 PB 2.9/12.7
450:0.285 0.202 6.6
357:9.7 PB 5.47/6.7
323:4.3 PB 4.95/5.5
306:2.2 YR 6.47/4.1
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760:List of colors
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112:primary colors
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1116:Color schemes
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911:. poynton.com
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892:Image Science
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780:Color mapping
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478:Orange yellow
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413:7.5 PB 4/10.7
412:
410:Purplish blue
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62:Macbeth chart
59:
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39:
31:
23:
19:
1021:
1010:, retrieved
994:
988:
970:
964:
916:
891:
882:
874:
871:
847:. Retrieved
836:. Springer.
832:
825:
804:
749:
733:
729:
481:10 YR 7/10.5
464:5 GY 7.1/9.1
461:Yellow green
427:Moderate red
371:Bluish green
289:3 YR 3.7/3.2
240:
229:
221:
205:colorimetric
200:
198:
168:
96:
84:
69:
61:
57:
51:ColorChecker
50:
48:
18:
877:(3). 95–99.
785:ICC profile
765:Color chart
687:Neutral 3.5
647:Neutral 6.5
571:2.5 RP 5/12
354:Blue flower
258:Description
174:mm (H) × 90
104:matte paint
43:SVG version
1105:Categories
849:12 October
814:Kollmorgen
796:References
554:5 Y 8/11.1
430:2.5 R 5/10
374:2.5 BG 7/6
303:Light skin
213:Illuminant
178:mm (W) × 9
140:human skin
100:35 mm film
60:or simply
955:See also
922:available
667:Neutral 5
627:Neutral 8
396:5 YR 6/11
286:Dark skin
108:lightness
1012:17 April
1003:archived
947:Archived
936:Archived
925:Archived
754:See also
594:#0885a1
577:#bb5695
560:#e7c71f
543:#af363c
537:5 R 4/12
526:#469449
509:#383d96
487:#e0a32e
470:#9dbc40
453:#5e3c6c
436:#c15a63
419:#505ba6
402:#d67e2c
380:#67bdaa
363:#8580b1
346:#576c43
329:#627a9d
320:Blue sky
312:#c29682
295:#735244
810:Macbeth
716:#343434
696:#555555
676:#7a7a7a
656:#a0a0a0
636:#c8c8c8
616:#f3f3f3
588:5 B 5/8
568:Magenta
447:5 P 3/7
337:Foliage
264:CIE xyY
160:oranges
152:chicory
142:, blue
132:magenta
64:) is a
977:
840:
818:X-Rite
699:18.6%
690:N 3.5/
679:18.4%
659:36.1%
650:N 6.5/
639:59.7%
619:90.0%
610:N 9.5/
551:Yellow
444:Purple
393:Orange
201:et al.
187:Colors
180:
176:
172:
164:lemons
156:orange
136:yellow
134:, and
93:Design
87:X-Rite
1006:(PDF)
999:(PDF)
944:Excel
719:3.0%
707:Black
607:White
517:Green
255:Index
203:with
120:green
1014:2012
975:ISBN
942:and
933:html
851:2015
838:ISBN
710:N 2/
670:N 5/
630:N 8/
585:Cyan
500:Blue
237:sRGB
228:and
211:and
162:and
148:leaf
128:cyan
124:blue
49:The
790:IT8
726:Use
534:Red
246:).
170:125
144:sky
116:red
1107::
1001:,
900:^
890:.
870:.
859:^
742:.
704:24
684:23
664:22
644:21
624:20
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582:18
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548:16
531:15
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497:13
475:12
458:11
441:10
244:65
233:50
225:65
166:.
130:,
126:,
122:,
118:,
1029:.
959:.
894:.
875:2
853:.
820:.
424:9
407:8
390:7
368:6
351:5
334:4
317:3
300:2
283:1
272:3
241:D
239:(
230:D
222:D
Text is available under the Creative Commons Attribution-ShareAlike License. Additional terms may apply.
