The document discusses the importance of precise color measurement for quality printing, noting that modern color measuring devices are generally based on spectrophotometers which provide higher measuring accuracy than densitometers. It describes the standard settings used for color measurement including the illuminant, observer angle, density and polarization filters, and white reference, and how matching the settings of a spectrophotometer to an old densitometer is necessary to take accurate measurements. Ensuring devices use the correct country-specific settings and standards helps achieve accurate color matching for printing.

1. COLOR MEASUREMENT THE RIGHT
WAY

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Quality Printing
• Quality printing depends on precise color measurement,
• Modern color measuring devices are generally based on spectrophotometers,
even if they only show densities.

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Quality Printing (cont’d)
• This is because of the higher measuring accuracy of spectrophotometry,
together with a greater range of available measurement values.

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Color Settings
• Correct setting often depends on the country such as the bvdm in Germany
and CGATS in the U.S. Settings can be made for the following values:
Illuminant
Observer angle
Density filter
Polarization filter
White reference

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Illuminant
• This defines the color temperature of the lighting source. For printing, the
standard is currently D50, which corresponds to 5,000 Kelvin.
Observer angle
• The standard observer angle in printing is currently defined as 2°. This
corresponds to the printer's observation angle in the matching stage.

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Density filter
• This determines the spectral range that is to be used to calculate the density
values for CMYK. "Status T" is used for measuring in the United States.
Polarization filter
• Polarization filters eliminate the gloss of wet ink. The wet values therefore
correspond almost entirely to the dry density and tonal values.

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White reference
• The "absolute white" setting is preferred for density measurement in
North America. In all other countries, the white reference is "relative." Paper
white is therefore always taken as the zero point here.
• To match a spectrophotometer to an old densitometer, it is necessary to
know the densitometer's settings precisely and apply exactly the same
parameters to the spectrophotometer.

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