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Several features in ScanImage require user graphical interaction -- e.g. selection of point, line, or area -- with one of the ScanImage [_Image Display Figures_|SI3.6_ImageDisplay]:
* {blue:CT} and _ROI Addition_ tools (buttons) on the [Main Controls|Main Controls (r3.8)] panel
* The 4 {blue:Image Tools}-- display zoom, display data tip, display histogram, and display statistics -- located at bottom of the [Image Controls|Image Controls (r3.8)] panel
When any of these graphical interaction tools are selected (button pressed), ScanImage determines which [_Image Display Figure_|SI3.6_ImageDisplay] the user should interact with based on the {blue:Default Target} value specified in the [Image Controls|Image Controls (r3.8)]. There are 5 valid figures to use with these tools: the _Channel <1-4>_ display figures and the _Channel Merge_ display figure.
By default, {blue:Default Target} is set to _None_. In this case, the user must first click on the desired [_Image Display Figure_|SI3.6_ImageDisplay] (which must be visible). Following this click, the appropriate interaction for the specific tool (i.e. point, line, or area selection) can be executed. If no figure is clicked within 5 seconds of selecting the graphical interaction tool, then the operation is cancelled.
In cases where the user may want to repeatedly employ the same [_Image Display Figure_|SI3.6_ImageDisplay] when using graphical interaction tools, then the {blue:Default Target} can be specified as one of the 5 valid figures for graphical interaction tools. If a figure is specified, the requirement to first click on the target image display figure is removed.
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