# Settings Tab

You use the controls in the Settings tab to create, move, delete, and view the reference points that define this tool's pixel mapping function. By default, Auto Compute Reference Points is checked and the tool generates a mapping by itself. If you want to change the mapping, disable the checkbox.

If Auto Compute Reference Points is unchecked, you can click and drag any reference point graphic (a small cross) to move a reference point. The mapping function defined by the reference points is shown in blue while the mapping function, as modified by the output scale, offset, and inversion is shown in green. The control enforces the requirement that the mapping function be monotonically increasing (each successive reference point must have an X-value greater than or equal to the preceding point).

Parameter | Description
--- | ---
Auto Compute Reference Points | When the enabled, ComputeMapping() is called as the user modifies any parameter that affect the reference points. Default is true.
(Advanced button) | Opens the advanced features (Compute Map Parameters). You can choose how the mapping is created and define the Output Range of the Output Parameters. Some of the advanced properties can be modified only if the Auto Compute Reference Points checkbox is disabled.
Logarithmic Histogram | If checked, the histogram of input image pixel values is displayed using a logarithmic scale for the Y-axis. Using the logarithmic display prevents the presence of a small number of bins with large numbers of samples from obscuring bins with small numbers of samples:
Output Depth | Sets the pixel depth of the output image. You can specify an 8-bit greyscale image (Grey (8 Bit)) as well as a 16-bit greyscale image with 8, 10, 12, 14, or 16 bits of actual image data. The Output image depth must be less or equal to the input image depth.
Default NonVisible Pixel Value | You can set the default value for pixels that are missing. The default non-visible pixel value (output1) is the first point. Otherwise it is user specified.
OutputScale | Sets the linear scale factor to apply to the output of the mapping function. Note: This property should be used at runtime for scaling, instead of Max Range Multiplier, because it multiplies all reference points.
OutputOffset | Sets the offset value to apply to the output of the mapping function.
OutputInverted | Inverts the output of the mapping function.