Kongsberg Simrad ST90, Reference Manual

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Colour Threshold function
The
Colour Threshold
function allows you to reduce or increase the number of colours. This
will provide a filtering effect that removes the weakest echoes.
How to open
This function is opened from the
Display
menu.
Description
The
Colour Threshold
function is used to control how many colours you wish to use in the
echo presentation. The selected colour threshold is reflected in the bottom bar.
This setting will thus reduce or increase the number of echo colours in the presentation.
• Weak echoes are shown with "cold" colours (blue).
• Echoes with medium strength have warmer colours (green and yellow).
• The stronger echoes are shown with the warmest colours (orange and red).
The strength of the echoes is indicated using a scale with 16 or 64 colours. When the number
of colours is reduced, the ST90 system will start by removing the colours that indicate the
weakest echoes. The number of colours to be deleted is defined as a percentage of the
total number of colours. The higher the number, the more colours are removed (until only
the strongest echoes are shown).
By reducing the number of colours you will therefore remove the weakest echoes from the
presentation. This causes the filtering effect. Since most echoes are weak when the range is
long, the filter effect will reduce the detection range.
Related topics
Functions and dialog boxes, page 416
Display menu; Functions and dialog boxes, page 440
Screen Brightness function
The intensity of the light given off by the display presentation can be adjusted. You can use
this function to increase or decrease the light from the screen to match the ambient light.
How to open
This function is opened from the
Display
menu.
Functions and dialog boxes