Northern Eclipse Help Reference

 Add Concentric Grid

This tool is used to overlay a black or white concentric grid over the current image.  You can move the origin of the grid by clicking on the image with the mouse.

This function is used when you need to subdivide an object into concentric rings to be measured separately.  It also allows you to group together all points that fall within a defined distance from a specified origin.  Whenever a single pixel wide line separates two objects, the 4-way boundary rule must be used to measure them (located on the Data Options page of the Northern Eclipse Options Dialog).

The “Steps” setting determines how many concentric rings to make.  The “Inner Radius” and “Outer Radius” settings work together to define the smallest and largest ring size.  The outer radius is in addition to the inner radius.   The “Bright on Dark” setting allows you to choose between a white and black grid. 

The grid remains as an overlay on the image even if you select another tool.  Once you are done with the grid overlay, you can remove it using the Remove Last Selection or Remove All Selection functions.  You can stamp the grid into the image by selecting the “Stamp” button.  The grid will then become part of the image and the overlay is removed.  Alternately, you can use the Duplicate Display function to stamp all overlays into the image.

See Also

Add Radial Grid, Add Line Grid, Add Curve Grid, Add Grid


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