ISO 18621-11 implementationISO TS 18621-11 Graphic Technology - Image quality evaluation methods for printed matter - Part 11: Colour gamut analysis describes methods of analysing and comparing the gamuts of colour prints. In Annex A it describes example test charts in RGB and CMYK which can be used in the analysis and volume calculation procedure described in the body of the standard.
Alternate test charts
An alternate patch set based on CMYK gamut boundary colours has been derived. The chart has 382 faces on the gamut surface. This patch set has been shown to give a gamut volume that is a close match to the reference values in Annex B when computed according to the method in ISO TS 18621-11.
The CMYK coordinates of the faces are given in a spreadsheet. This set of CMYK coordinates is present in a number of standard test charts used for printer characterizations:
Download alternate test chart spreadsheet
Gamut volume computation tool
An Excel spreadsheet is provided to compute the gamut volume from a characterization data set (formatted as specified in ISO 12642-2). The spreadsheet include an example data set, and other data sets can be copied in to give the gamut volume as defined in ISO TS 18621-11.
Download gamut volume computation tool
Errata in ISO TS 18621-11:2019
Users of ISO TS 18621-11:2019 should be aware of two issues in the published standard.