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Rendering a raster dataset with the Discrete Color renderer

The Discrete Color renderer is used to display the values in the raster dataset using a random color. It can only be used with integer raster datasets, and a legend is not generated.

This renderer is similar to the Unique Values renderer, but it is more efficient when there are a large number of unique values as it does not have to calculate how many unique values exist. The Discrete Color renderer will assign a color to each unique value until it reaches the maximum number of colors that you chose. The next unique value will start at the beginning of the color scheme; this process will continue until each unique value has a color assigned to it.

A legend displaying which color is mapped to which value is not generated or displayed in the table of contents.

  1. Right-click the raster layer in the table of contents and click Properties.
  2. Click the Symbology tab.
  3. Click Discrete Color.
  4. Click the Color scheme drop-down arrow and click a color scheme.

    Right-click the color scheme to

    • Toggle between a graphic view and text view.
    • Open the Properties to modify specifics about how the color ramp is generated.
    • Save the color ramp.

  5. Type a value in the Number of colors text box.

    The number of discrete colors must be an integer. The discrete color renderer will assign a color to each unique value until it reaches the maximum number of colors that you chose. Then the next unique value will start at the beginning of the color ramp; this process will continue until each unique value has a color assigned to it.

  6. Optionally, click the Display NoData as button to symbolize the NoData using a color.
  7. Click OK.

Related Topics

  • Renderers used to display raster data
  • Image Analysis window: Display section
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