Reference manual
81
857-160970 / Rev.H
Colour Scale
The Colour Scale dialogue box is opened when you right-click
on the colour scale in the Header view.
This dialogue controls the mapping of echo strength into one out
of 12 colours, light blue for weak signals and dark brown for
strong signals. Each discrete colour represents a 3 dB range of
echo signal strength implying that the next colour is selected
every time the echo strength doubles.
Parameters
A high numeric value displays weak echo signals properly while
the stronger signals saturate into dark brown colour. A low
numeric value displays strong echo signals properly. Weak
signals below the lower limit of the colour scale are not
displayed (the display background colour is used).
School Gain - This parameter controls the display sensitivity of
the echo sounder down to the detected bottom depth when
School Gain is selected in the Echogram dialogue box. A
numeric value of 70 sets the lower limit of the echogram colour
scale equal to a volume backscattering strength of -70 dB.
Fish Gain - This parameter controls the display sensitivity of
the echo sounder down to the detected bottom depth when Fish
Gain is selected in the Echogram dialogue box. A numeric
value of 50 sets the lower limit of the echogram colour scale
equal to a target strength of -50 dB.
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