Module category: Filter

• ColorDistance
  • Parameters
  • Input Ports
  • Output Ports
  • Examples

ColorDistance

This module is able to calculate distances between color data.

The module owns three ports for incoming and one port for outgoing data. The input ports accept RGB data, while the output port delivers the alpha channel.

The calculation of the color distance can be modified by a few parameters:

ReferenceColor

This is the color value on which the calculation is based on. You can choose the color from a color table (folder button), a color picker (pipet button) or you can fill in manually the RGBA values.

Metric

Two different metrics can be used to calculate the color distance. You can choose between:

• euclidian distance or
• manhattan distance

DistanceBase, DistanceMultiplier

The sliders represent values for the calculation of the distance. This way, the calculation can be modified directly out of the Map Editor.

Parameters

Name	Type	Description
ReferenceColor	Color	Color to which the distance is calculated
Metric	Choice	Metric for calculation of the distance for transparent values.
DistanceBase	FloatSlider	This value is added to the calculated distance.
DistanceMultiplier	FloatSlider	This value multiplies the calculated distance.

Input Ports

Name	Type(s)	Description
Red	Float	Scalar volume data (red channel)
Green	Float	Scalar volume data (green channel)
Blue	Float	Scalar volume data (blue channel)

Output Ports

Name	Type(s)	Description
Data	Float	Scalar volume data

Examples

A "classical" combination for this module is the example ColorDistance.net. It uses the module ColorDistance for adding an alpha channel to the RGB data to handle the opacity.