| Specim IQ User Manual | 25
Figure 30: Creating a Mask
a) Use the touch screen to select a target from the image.
The screen below is opened:
Figure 31: Selecting a Target
b) Use the slider or UP and DOWN buttons to adjust the mask threshold.
In short, Threshold defines the spectral range that will be visualized as the identified substance. Slide the
slider and see the results on the full-size view, until you have overlaid the desired range, depicted with the
selected Class color. See also the tip below.
From a more technical perspective, the Threshold slider range depicts the spectra from the entire image in
such a way that, on the right, there are the spectra that most resemble the reference spectrum, and on the left
there are the spectra that least resemble the reference spectrum. The spectra on the right-hand side of the slider
are visualized in the full-size view.
Tip:
If you select a strict Threshold, that is, a value close to 1.0, you will get a class that indicates the
correct areas of interest in the captured images, and hardly any false positive results. However,
sometimes you also want to get false positive results. In this way, you can capture images that possibly
contain the substance to be identified. If this is the case, use a less strict threshold value.
c) Select SAVE AS TARGET.
The screen below is opened:
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