Skip to content

Color Mapping

Adjust the Value Range

To modify the value ranges of the displayed variable, click on the legend area where the value ticks are shown.

Min/Max

Enter the desired values in the Minimum and/or Maximum text fields, or adjust the values directly on the slider.

Value Ranges

Log-scaling

Enable log-scaling for the value range by toggling the switch in the top-right corner. [1]

Color Map Value Range

If the color mapping has an assigned value range, apply it to the variable using the button at the top. [2]

Change or create Color Maps

Colormap

Change the color mapping by clicking on the color range in the legend.

Modify Map Presentation

Modify the presentation of the selected Color Map by [1]

  • changing the opacity
  • hiding small values
  • reversing the color map

Predefined Color Maps

Select a desired predefined color map from a wide range of maps (e.g. sequential, diverging, qualitative) [3].

User-defined Color Maps

Add a user-defined color map with the +-button [2]. User-defined color mapping that associates data values or ranges of data values with color values. The lines in the text box have the general syntax <value>: <color>, where <color> can be

  • a list of RGB values, with values in the range 0 to 255, for example, 255,165,0 for the color Orange;
  • a hexadecimal RGB value, e.g., #FFA500;
  • or a valid HTML color name such as Orange, BlanchedAlmond or MediumSeaGreen.

The color value may be suffixed by a opaqueness (alpha) value in the range 0 to 1, for example 110,220,230,0.5 or #FFA500,0.8 or Blue,0. Hexadecimal values can also be written including an alpha value, such as #FFA500CD.

The interpretation of the <value> depends on the selected color mapping type:

  • Continuous: Continuous color assignment, where each <value> represents a support point of a color gradient.
  • Stepwise: Stepwise color mapping where values within the range of two subsequent <value>s are mapped to the same color. A <color> gets associated with the first <value> of each boundary range, while the last color gets ignored.
  • Categorical: Values represent unique categories or indexes that are mapped to a color. The data and the <value> must be of type integer. If a category does not have a <value> in the color mapping, it will be displayed as transparent. Suitable for categorical datasets.