# Run-Time Processing Parameters when Scale is Enabled

By default, the Blue Locate Tool and Blue Read Tool allow you to specify the absolute range of feature (or characters for the Blue Read tool) sizes, in pixels, to match. Features with sizes in the search range will be matched, and those outside the range will not be matched. If Non-uniform scale is enabled, then the "size" of the feature is defined as the geometric mean of the X- and Y- dimension of the feature.

When considering the runtime scale range for non-uniform scale, the scale of a particular found feature is equal to the geometric mean of the X- and Y-sizes of the found feature, divided by the geometric mean of the X- and Y-sizes of the tool’s Feature Size.

- When the Scaled parameter is enabled, set to Uniform, the Scale Perturbation parameter will be removed, and a Size Range Processing parameter will be added so you can modify the scale during runtime.
- When the Scaled parameter is enabled and set to Non-uniform, the Scale and Aspect-Ratio Perturbation parameters will be removed, and Size Range and Aspect-Ratio Range Processing parameters will be added so you can modify them during runtime.

Note: The Blue Read tool has the Scaled parameter enabled and set to Non-uniform, by default.