You can preview feature presets in the features tree whenever you train a classifier or before you segment a dataset.
You should note that dataset feature previews are computed for the selected filter and for the visible portion of the image in the current view(s).

The Preview Trainer dialog appears.
Note You can preview dataset features on any dataset included in the model.
The preview of the dataset feature appears in the workspace.
Note You can preview dataset features on different image slices.
You should note that region feature previews are computed for the selected region.

The grid is computed automatically and the Preview Trainer dialog appears.
Note You can preview dataset features on any dataset included in the model.

Note The configured action for selecting regions is 'Select Regions in Trainer'. See Configurable Actions for more information about setting the configured actions for Dragonfly.
The selected region is highlighted in red and the region information is plotted or displayed in the Preview Trainer, as shown below.
Note You can use the Histogram tools to zoom and pan histograms, if required.
Note If you pan the image or change the image slice, you may have to compute the regions. To do so, click the Compute Regions button.
Note You can preview the region features on any dataset included in the model.