Color Measurement Notes; Selecting, Preparing, And Presenting Samples - HunterLab LabScan XE User Manual

Color Measurement Notes

The LabScan XE can be used to measure the color of a variety of products. Its 0°/45° geometry "sees"
color the way the human eye sees color, its circumferential viewing reduces the effect of sample
directionality by detecting the light evenly from the entire measured surface, and its specular excluded
mode takes into account the entire appearance of samples, including the color component and the
geometric component (gloss and texture).
When measuring samples it is important to select them appropriately, use an established measurement
method, and handle all samples in a consistent manner. The following guidelines will help you while
taking measurements.

Selecting, Preparing, and Presenting Samples

1. Choose samples that are representative of the material used. If samples are non-representative of the
batch or are spoiled, damaged, or irregular, then the result may be biased. When choosing a sample,
select randomly and examine the sample to avoid biased results. If your sampling procedure is
adequate, a different sample selected from the same batch should result in comparable measured
values.
2. Prepare samples in exactly the same manner each time they are measured. Follow standard methods
if they exist, such as ASTM or TAPPI methods.
3. Present the samples to the instrument in a standard, repeatable manner. Results measured depend on
the condition of the samples and their presentation. If you establish a method so that the same
procedure is used each time specific samples or types of samples are measured, then you will have a
valid basis or comparison of measured results. This also ensures repeatability of results when
measuring the same sample. Make a checklist so that operators may simply check each step. The
checklist will also help in the training of new operators.
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