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+.help crgrow Apr98 noao.imred.crutil
+.ih
+NAME
+crgrow -- grow cosmic rays in cosmic ray masks
+.ih
+USAGE	
+crgrow input output radius
+.ih
+PARAMETERS
+.ls input
+List of cosmic ray masks to be modified.
+.le
+.ls output
+List of output modified cosmic ray masks.  The input and output lists must
+match.  If the input and output cosmic ray masks are specified as the same
+then the input mask will be modified in place.
+.le
+.ls radius = 1.
+Replacement radius around cosmic rays.
+If a pixel is within this distance of a cosmic ray pixel
+it is identified by a value of 1 in the output cosmic ray mask.  Distances are
+measured between pixel centers which are have integer coordinates.
+.le
+.ls inval = INDEF
+Mask value to be grown.  A value of INDEF will grow all non-zero values.
+.le
+.ls outval = INDEF
+Mask value for grown pixels.  A value of INDEF will use the value of the
+pixel being grown for the grown pixel value.
+.le
+.ih
+DESCRIPTION
+The cosmic ray pixels, identified by the "inval" parameter, in the input
+mask are located and all unmasked (zero valued) pixels within the specified
+grow radius are set to a value given by the "outval" parameter. The
+distance between pixels is measured as a cartisian logical pixel coordinate
+distance.
+.ih
+EXAMPLES
+1.  A radius of 1 will grow cosmic rays in a "plus" pattern.
+
+.nf
+    cl> crgrow crmask1 crmask2 1
+.fi
+
+2.  A radius of 1.5 will grow cosmic rays in a box pattern.  The following
+will modify the input mask.
+
+.nf
+    cl> crgrow crmask crmask 1.5
+.fi
+.ih
+SEE ALSO
+imreplace
+.endhelp