InfraTec VarioCAM User Manual page 46

Menu item Palette →16 Steps toggles the display between the default colour depth of 256 colours and 16
steps. By activating the "16 Steps" function, only 16 temperature levels will be displayed instead of 256.
Thereby, distinctions in the image beyond the 16 levels will not be visible any more, "summarising" the
scene in 16 "classes" of the same temperature level (see Fig. 62).
Fig. 62 Colour scale 256 colours (left) and 16 colours (right)
The menu item Palette →Logarithmic toggles the display of temperature values between linear and
logarithmic progression. By default, the linear display of temperatures has been selected. Activating this
function facilitates to use a more differentiated resolution for the lower temperature range than for the
higher one. The effects of the logarithmic presentation can be seen in Fig. 63. The linear colour scale is
displayed on the left. The one in the middle shows its logarithmic version. For better visualisation of the
logarithmic grading, the right one shows the same version defined by only 16 colours, clearly showing the
higher colour resolution for the lower temperatures.
Fig. 63 Linear BlackWhite colour scale (left) and its logarithmic presentation (middle) and its
logarithmic presentation in 16 colours (right)
Logarithimic presentation is recommended for scenes of high temperature dynamics where,
independently of large differences between temperature maximum and minimum, a differentiated
presentation in the lower temperature range is of importance, for example, a printed circuit board with a
"hot" component where, apart from T
interest.
Activation of the functions "Inverse", "16 Steps" or "Logarithmic" is marked by a prefixed checkmark in
front of the respective menu item. The combination of all three options with each other is possible.
Menu item "Image filter"
Fig. 64 Menu item "Image" - "Image filter"
Using the menu item "Image filter", a filter for the presentation of thermal images can be adjusted. As a
filter, a digital low-pass filter of the first order is used.
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User Manual for the Thermographic System VarioCAM
, temperature differences in the lower display range are also of
Max
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