Barbieri Spectro LFP qb Operating Manual page 25

Spectro LFP qb - Operating Manual
Transmission
Transmission calibration is done automatically on the position of the
upper left corner of the target area.
In transmission mode, you have the option to choose between two
calibration modes:
• relative (default) or
• absolute
Relative white calibration
Nearly all linearization and profiling targets require to calibrate against
the white of the material to be measured, assuming this as the refer-
ence white with a value of L*=100 a*=0 b*=0.
This is in particular necessary for the creation of ICC profiles for non
completely transparent materials (diffuse opaque materials etc.). In this
case, the calibration area is covered by the white part of the material
and the instrument automatically calibrates to that white.
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