4 References

Frame supports CSV and ANSI IT 8.7 compatible reference files. The ANSI IT 8.7 compatible reference file is usually delivered with the test chart. The CSV compatible reference files can be created with a spreadsheet application.

The references can be defined in AdobeRGB, sRGB, ProPhotoRGB, XYZ, and LAB color spaces. If the RGB color space has not been defined, the AdobeRGB color space is applied. If the observer and the illuminant of the LAB color space have not been defined, the CIE 2 degrees observer and the D50 illuminant are applied.

Frame supports several different row and column identification methods. In case of symmetric color charts and gray scales, the application identifies automatically the following methods:

- Rows and columns are identified with alphabets and numbers (Kodak, Wolf Faust, and HutchColor).
- Rows and columns are identified with numbers and alphabets.
- Rows and columns are identified with prefixs "R" and "C" (Danes-Picta).
- All samples are identified with a counter (X-Rite).

If the method of the test chart is not supported or the application cannot identify the samples automatically, please send email to support@katelabs.com. Remember to add the reference file to the email.

In case of gray scales and asymmetric gray scales, the application identifies also the following method:

- All samples are identified with a counter with prefix "GS" (Kodak and Wolf Faust).

4.1 ANSI IT 8.7

Keywords

The following keywords are supported:

- ORIGINATOR (string)
- DESCRIPTOR (string)
- CREATED (string)
- OBSERVER (string)
- ILLUMINANT (string)
- NUMBER_OF_FIELDS (unsigned integer)
- NUMBER_OF_SETS (unsigned integer)
- MANUFACTURER (string)
- PROD_DATE (string)
- SERIAL (string)
- MATERIAL (string)
- INSTRUMENTATION (string)
- MEASUREMENT_SOURCE (string)
- PRINT_CONDITIONS (string)

The keywords are case insensitive. Unsupported keywords are automatically ignored.

Data format and data

The data format and the data must be defined using the following keywords:

- BEGIN_DATA_FORMAT / END_DATA_FORMAT
- BEGIN_DATA / END_DATA

The data format must use the following identifiers:

- RGB_R / RGB_G / RGB_B
- XYZ_X / XYZ_Y / XYZ_Z
- LAB_L / LAB_A / LAB_B

Unsupported identifiers are automatically ignored.

Empty lines and comments

Empty lines and single line comments are ignored. Single line comments start with the number sign (#) and end at the end of the line.

Example

#----------------------------------------------------------------------------------
# ColorChecker - 2005
#
# The RGB references are defined in the AdobeRGB color space.
#----------------------------------------------------------------------------------

#----------------------------------------------------------------------------------
# General
#----------------------------------------------------------------------------------
OBSERVER 2
ILLUMINANT D50
MANUFACTURER X-Rite
SERIAL 2005

ORIGINATOR Kate Labs
DESCRIPTOR The references in the AdobeRGB and LAB color spaces for ColorChecker
CREATED 8th Mar 2010

NUMBER_OF_FIELDS 7
NUMBER_OF_SETS 24

ROD_DATE Not available
MATERIAL Not available
INSTRUMENTATION Not available
MEASUREMENT_SOURCE Not available
PRINT_CONDITIONS Not available

#----------------------------------------------------------------------------------
# Data format
#----------------------------------------------------------------------------------
BEGIN_DATA_FORMAT
SAMPLE_ID,RGB_R,RGB_G,RGB_B,LAB_L,LAB_A,LAB_B
END_DATA_FORMAT

#----------------------------------------------------------------------------------
# Data
#----------------------------------------------------------------------------------
BEGIN_DATA
1 107 82 70 37.986 13.555 14.059
2 184 146 129 65.711 18.130 17.810
3 101 122 153 49.927 -4.880 -21.925
4 95 107 69 43.139 -13.095 21.905
5 128 127 173 55.112 8.844 -25.399
6 129 188 171 70.719 -33.397 -0.199
7 201 123 56 62.661 36.067 57.096
8 77 92 166 40.020 10.410 -45.964
9 174 83 97 51.124 48.239 16.248
10 86 61 104 30.325 22.976 -21.587
11 167 188 75 75.532 -23.709 57.255
12 213 160 55 71.941 19.363 67.857
13 49 65 143 28.778 14.179 -50.297
14 99 148 80 55.261 -38.342 31.370
15 155 52 59 42.101 53.378 28.190
16 227 197 52 81.733 4.039 79.819
17 169 85 147 51.935 49.986 -14.574
18 61 135 167 51.038 -28.631 -28.638
19 245 245 242 96.539 -0.425 1.186
20 200 201 201 81.257 -0.638 -0.335
21 160 161 162 66.766 -0.734 -0.504
22 120 120 121 50.867 -0.153 -0.270
23 84 85 86 35.656 -0.421 -1.231
24 52 53 54 20.461 -0.079 -0.973
END_DATA

Example 4.1 ANSI IT 8.7 compatible reference file for ColorChecker compatible test chart.

4.2 CSV

Keywords

The following keywords are supported:

- Originator (string)
- Descriptor (string)
- Created (string)
- Observer (string)
- Illuminant (string)
- ColorSpace (string)
- NumberOfFields (unsigned integer)
- NumberOfSets (unsigned integer)
- Manufacturer (string)
- ProductionDate (string)
- Serial (string)
- Material (string)
- Instrumentation (string)
- MeasurementSource (string)
- PrintConditions (string)

The keywords are case insensitive. Unsupported keywords are automatically ignored.

Data format and data

The data format and the data must be defined using the following keywords:

- BeginDataFormat / EndDataFormat
- BeginData / EndData

The data format must use the following identifiers:

- RGB_R / RGB_G / RGB_B
- XYZ_X / XYZ_Y / XYZ_Z
- LAB_L / LAB_A / LAB_B

Unsupported identifiers are automatically ignored.

Empty lines and comments

Empty lines and single line comments are ignored. Single line comments start with the number sign (#) and end at the end of the line.

Example

#----------------------------------------------------------------------------------
# ColorChecker - 2005
#
# The RGB references are defined in the AdobeRGB color space.
#----------------------------------------------------------------------------------

#----------------------------------------------------------------------------------
# General
#----------------------------------------------------------------------------------
Observer,2
Illuminant,D50
Manufacturer,X-Rite
Serial,2005

Originator,Kate Labs
Descriptor,The references in the AdobeRGB and LAB color spaces for ColorChecker
Created,8th Mar 2010

NumberOfFields,7
NumberOfSets,24

ProductionDate,Not available
Material,Not available
Instrumentation,Not available
MeasurementSource,Not available
PrintConditions,Not available

#----------------------------------------------------------------------------------
# Data format
#----------------------------------------------------------------------------------
BeginDataFormat
SAMPLE_ID,RGB_R,RGB_G,RGB_B,LAB_L,LAB_A,LAB_B
EndDataFormat

#----------------------------------------------------------------------------------
# Data
#----------------------------------------------------------------------------------
BeginData
1,107,82,70,37.986,13.555,14.059
2,184,146,129,65.711,18.130,17.810
3,101,122,153,49.927,-4.880,-21.925
4,95,107,69,43.139,-13.095,21.905
5,128,127,173,55.112,8.844,-25.399
6,129,188,171,70.719,-33.397,-0.199
7,201,123,56,62.661,36.067,57.096
8,77,92,166,40.020,10.410,-45.964
9,174,83,97,51.124,48.239,16.248
10,86,61,104,30.325,22.976,-21.587
11,167,188,75,75.532,-23.709,57.255
12,213,160,55,71.941,19.363,67.857
13,49,65,143,28.778,14.179,-50.297
14,99,148,80,55.261,-38.342,31.370
15,155,52,59,42.101,53.378,28.190
16,227,197,52,81.733,4.039,79.819
17,169,85,147,51.935,49.986,-14.574
18,61,135,167,51.038,-28.631,-28.638
19,245,245,242,96.539,-0.425,1.186
20,200,201,201,81.257,-0.638,-0.335
21,160,161,162,66.766,-0.734,-0.504
22,120,120,121,50.867,-0.153,-0.270
23,84,85,86,35.656,-0.421,-1.231
24,52,53,54,20.461,-0.079,-0.973
EndData

Example 4.2 CSV compatible reference file for ColorChecker compatible test chart.

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