The spectrum arithmetic
functions provide basic arithmetic operations for two or more 2D data
objects. The spectra can be added, subtracted, multiplied, divided or
review the section Spectrum Arithmetics in the chapter Mathematics for
a detailed description.
Spectrum arithmetics are performed as follows:
At least two spectra must be located
in the same data view to run this operation! If more than two spectra
are merged into a data view when executing spectrum arithmetics, the operation
will be applied to all merged spectra except the selected reference spectrum.
The reference spectrum is the
spectrum that is active/selected when the spectrum arithmetics command
is executed. It is the spectrum that will be added to/substracted from
the other spectra - or the other spectra will be multiplied with/divided
Switching of the reference spectrum
is simply done by selecting a different spectrum before the calculation
The spectrum arithmetics parameter will be adjusted in the mathematics
tab as follows:
Select the arithmetic function
from the drop down box by clicking in the Operation
Adjust the Scaling Factor by entering numerical values or using the
slider. The default scaling factor is
1 and for normal arithmetic operation this should stay untouched.
Adjusting the factor is only necessary if the reference spectrum needs
to be scaled before the arithmetic operation is carried out.
Enable or disable the Full Range
checkbox, if you like to apply the arithmetic function just to a spectral
region or the whole spectrum area.
Full Range unchecked
A spectral region can be adjusted either manually or graphically.
Enter the desired region boundaries into the fields Minimum
Move the gray selection area (tracker tool) to the desired position.
The size of the selection area can be adjusted by dragging the adjustment
Full Range checked
The full spectral range is used for the calculation.