Raster Edit Options
General Settings for working with images can be found in the
command Raster Edit Options. Defaults are shown below.
Pixels to skip: This setting applies to
the Trace Line and Trace Polyline commands. As the program
determines where to draw the new linework, it can "skip" or pass
over a given amount of pixels who's color does not match the rest
of the linework that is being processed. This allows for longer
length polylines to be created on poor quality images. A larger
amount of pixels to skip will typically create longer length new
linework.
Line and Polyline layer determines the Layers
for the new linework.
Close polyline tolerance
(pixels): While running the Trace Polyline command, this
setting will automatically close the polyline if you select an
point within the defined tolerance from the starting point.
Contour interval: In the
Contour Mode of Trace Polyline, this setting determines the value
to add or subtract to polyline elevations.
Elevation Mode: Zero,
Contour, or Prompt. By default, Trace Polyline creates linework at
Zero elevation. Contour
Mode speeds up elevating multiple polylines by adding (or
subtracting) the Contour interval to the previous elevation value.
Prompt Mode allows the user
to specify the elevation of each polyline created.
Thicken min surrounding pixels
(1-8): When running the "rasthicken" command (type-in only,
not in pull-down menu), the routine looks at the surrounding pixels
of an individual pixel and will change the color of that individual
pixel to the surrounding pixels if minimum amount is met. The lower
the number, the more "thickening" or densifying will occur.
Thicken pass count (1-20):
This is the number of times the "rasthicken" command (type-in only,
not in pull-down menu) will run in a selected area. The greater
number of passes, the more "thickening" or densifying will
occur.
Draw new linework will
update the source Image file with the new linework you create
through "Trace Line" or "Trace Polyline".
Erase existing linework
will remove linework segments from the source Image file as you
trace over those segments.
Pulldown Menu Location: Raster > Raster Edit Options
Keyboard Command: rasopts
Prerequisite: none