                                                                thin_lines 
Chapter 11 Raster Manipulation

The thin_lines command is used to reduce the width of all lines in a raster by
deleting rows of pixels off of each side of each line.  This is most useful for
scanned data in which linework is often greater than unit width.  Two arguments
control the type of thinning action which occurs: the t value is a code which
defines the thinning type and is a mandatory parameter; the default is 0, as
described below. An optional [p] value identifies the number of thinning passes
that LTPlus should make through the data; the default is 0, which thins until
all lines are a single pixel in width.

thin_lines

    Thins raster lines.
     
         thin_lines t [p]

    Removes one pixel row from both sides from all lines for each pass
    specified.  The thinning type action can be defined.
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    Options/arguments:

         t         Thinning type.  Zero (0) is the default.
                   0 =  Nondestructive, leave spur ends, remove square corners
                        and stairsteps.
                   1 =  Nondestructive, leave spur ends, leave square corners
                        and stairsteps.
                   2 =  Destructive, removes all edge pixels, including all 1
                        pixel wide lines!!!!!  (This is for special uses only,
                        not for general consumption.)
         p         Number of passes for thinning.  The default is zero, which
                   thins until single pixel width is reached.
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    Example(s):

    To thin the raster lines in a non-destructive manner removing corners and
    stairsteps, enter:

         thin_lines 0
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    See also:

              assemble
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