Why larger Measuring Aperture counts

Barbieri published a white paper ‘Why larger Measuring Aperture counts’. This white paper explains why a larger optical measuring aperture improves significantly accuracy and repeatability of measurements in digital large-format, flatbed and industrial printing. It gives also hints about how to get most accurate measurement results on special materials such as textiles.
Summary:
Introduction The technical datasheets and specifications of every spectrophotometer, among other technical details, mention the measuring aperture. But why does this matter? It is because, generally said, a larger measuring aperture gives more accurate results and higher repeatability.
The measuring aperture defines the area the measuring device “sees” and captures the color values from. As bigger this area, as more information will be captured. This especially in large format, flatbed and industrial printing, including textile printing is of upmost importance. When measuring different kind of media, low resolution prints or UV printing, a bigger measuring area is requested.
The following statements are supported by the scientific paper: Nadile Nunes de Lima, “Measurement uncertainty  for printed textiles”, Colour and Visual Computing Symposium (CVCS), 2018. The Barbieri Spectro LFP qb is a device with switchable measuring aperture of 2, 6 and 8 mm as mentioned in this publication. The findings in this publication are not limited to textile but they are valid for any kind of structured material used in digital Signage and Industrial printing.
2 Reasons for more accurate measurements
When measuring structured materials, a larger optical aperture gives more accurate and repeatable results because: – a bigger aperture captures a larger area and therefore also information which is outside the area of a smaller aperture – a bigger aperture compensates the scattered light due to the structured surface – a bigger aperture compensates the potential shadows on structured materials
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