Altair® Panopticon


Color Variable Configuration for Numeric Columns

When you add a numeric column to a Color variable, the configuration pane displays a set of options similar to the pane for the Size variable. This allows you to define the data display format and aggregation method:

Other configuration options for numeric color variables include:

q  Range

The Min and Max text boxes are populated default values from the data set.

q  Automatic Limits/Range Calculation

Disables the Range option and supports either:


·         Zero Center range calculation

·         Mean Center range calculation

q  Divide By

Enter the Divide By value then click  to divide fixed and automatic ranges.

For example, for this range:

When the Divide By is 10000, then the range values will be:

Another example for the Automatic Range:


When the Divide by is 1000000, then the automatic range values will be:


q  Palette

The text, sequential, and diverging color palettes that is used in numeric color variables in visualizations


q  General Colors

The general colors to be used for visualizations.


q  Continuous/Stepped Colors

The color palette can either be a continuous color gradient or a stepped color gradient.

You can define this setting using the appropriate radio button.

Continuous Colors produces this effect:

Stepped Colors produces this effect:

Select the number of steps in the gradient in the Steps list box.

q  Reversed Colors

You can reverse the color palette for cases where a high number indicates poor performance. For example, if your data shows high risk as a high number, it may be more useful to display high risk using Red rather than Blue. 

Standard Palette

Reversed Palette


q  Distinct Outlier Colors

When outliers are of particular interest, you can highlight outliers using the Distinct Outlier Colors function.

Without Outlier Colors

With Outlier Colors

q  Highlighted Outlier Colors

Where only the outliers are important, the central color range is grayed and only the Distinct Outlier Colors are highlighted in the visualization.

With Outlier Colors

With Highlighted Outlier Colors


Panopticon supports two types of Numeric Color Palettes: Sequential and Diverging.

q  Sequential Color Palettes

Sequential Palettes use a two-color gradient between a minimum and a maximum value. Numeric column containing only positive values default to a Sequential Palette using the White-Blue color palette.

In this case the range Mid point is disabled, and the Min and Max points are populated with defaults from the data set.

q  Diverging Color Palettes

Diverging Palettes use a three-color gradient between a minimum, middle and a maximum value. Numeric columns containing both positive and negative values default to the Diverging Palette with the Red White Blue color palette selected.

Diverging Palettes use the Range Midpoint. The Min, Mid and Max points are populated with defaults from the data set.