Color determination through colour measurement patches

To determine the profile, a colour measurement chart (also known as a test chart) is first printed out with various defined colour values taken from a reference file. These are then illuminated and read in by a spectrophotometer, the most important colour measuring device in colour management.¹ After that, the reference colour values are compared to the spectrophotometer measurement to determine how linear or non-linear the colours are mapped in the reproduction, can document tone value increase or decrease, and respond accurately within the colour space.

PDF/X und Colormanagement: Ein Handbuch für die Erstellung von Highend-PDF-Druckdaten, S. 40, Cleverprinting PreMedia-Solutions, 2016

Colour process accuracy

The more patches, i.e. color fields, a test chart has, the more accurate it is. When creating the test charts, a number of 418 patches (19 rows of 22 columns each) was used, since this makes optimal use of an A4 sheet. This results, in theory, in a medium sized spectral data set. Of course, it would be possible to work with a larger spectral data set (e.g. 836 fields), but this requires longer times in the spectral data measurement by the spectral measuring device. In addition, the test result may become inaccurate due to the inaccuracy of the risograph. Finally, it is unknown to what extent the risograph varies in reproducing the colours to achieve a reliable measurement result. This individuality within each original underlines the craftsmanship of the risograph.

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Exploriso: Low-tech Fine Art