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Size
•
Recommended: A single sample should be between
150 x 150 mm and 200 x 200 mm.
•
Sample holder is designed to handle up to 297 x 210
mm (A4) samples.
•
A clean region of interest must be at least 20 x 20 mm
•
The measurement spot of the TAC7 is 130 mm in
diameter. The region of interest must fit into this circle.
Thickness
•
Samples cannot be more than than 30 mm thick.
Depth of Field
Samples can have surface depth variability up to ±3 mm. Materials with overlapping structures
(e.g. tree bark, fur, hair, high floor carpet) are not suitable for measurement (at this time) as
parts of the material will remain invisible for the cameras which can cause artifacts.
Material Variety Limitations
It is not possible to create seamless patterns for materials with large (specifically, larger than an
inscribed rectangle in the 130 mm diameter measurement area) or non-periodic pattern repeats
(e.g. wood, certain fabrics, certain stone types, etc.) except in the case of car paint. The initial
version of the TAC7 is limited to the visible spectrum (VIS) and cannot detect fluorescence.
Optical brightening agents (OBAs) or fluorescent whitening agents (FWAs), which play an
important role in the paper and textile industry, are also not considered in the measurements.
Transparent materials cannot be measured. Also retro-reflection cannot be detected with the
current design of the device.
T A C 7
A p p e a r a n c e
297 mm x 210 mm
Sample thickness 30 mm
Measurement area
C a p t u r e
S y s t e m
Sample size:
Measurement
spot
130 mm
9
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