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Instructions provided describe how to compute a histogram with all unique values when using a classified renderer.
When the classified renderer computes the class breaks, it does a quick estimate based on the histogram, by default.
If a more accurate classification needs to be calculated using each unique value, a Windows registry setting must be modified.
This knowledge base article does not apply to ArcGIS Desktop 9.3 Final. It is applicable to the ArcGIS Desktop 9.3 Raster Renderer Patch, ArcGIS 9.3 Service Packs, ArcGIS 9.3.1, and ArcGIS 10.0.
To calculate the classification using all the unique values, a new DWORD Value must be created in the registry. When the value is set to 0, the default quick computation is implemented. When the value is set to 1, an accurate computation using all the unique values is performed.