NAME

     makecpt - Make GMT color palette tables


SYNOPSIS

     makecpt [ -Ctable ] [ -I ] [ -Tz0/z1/dz | -Tztable] [ -V ] [
     -Z ]


DESCRIPTION

     makecpt is a utility that will help you make  color  palette
     tables  (cpt  files).  You define an equidistant set of con-
     tour intervals or pass your own z-table, and  create  a  new
     cpt  file based on an existing master cpt file.  The result-
     ing cpt file can be reversed relative to the master cpt, and
     can be made continuous or discrete.


OPTIONS

     -C   Selects the master color table  table  to  use  in  the
          interpolation.   Choose among the built-in tables (type
          makecpt to see the list) or give the name of an  exist-
          ing cptfile [Default gives a rainbow cpt file].

     -I   Reverses the sense of color progression in  the  master
          cptfile.

     -T   Defines the range of the  new  cptfile  by  giving  the
          lowest  and highest z-value and the interval.  Alterna-
          tively, give the name of a ASCII file that has  one  z-
          value  per record.  If not given, the existing range in
          the master cptfile will be used intact.

     -V   Selects verbose mode, which will send progress  reports
          to stderr [Default runs "silently"].

     -Z   Creates a continuous cpt file [Default  is  discontinu-
          ous, i.e. constant colors for each interval].


EXAMPLES

     To make a cpt file with z-values  from  -200  to  200,  with
     discrete  color  changes  every  25, and using a polar blue-
     white-red colortable, try

     makecpt -Cpolar -T-200/200/25 > colors.cpt

     To make an equidistant cpt file from z = -2 to 6,  in  steps
     of 1, using continuous default rainbow colors, try

     makecpt -T-2/6/1 -Z > rainbow.cpt

     To make a GEBCO look-alike cpt file for bathymetry, try

     makecpt -Cgebco > my_gebco.cpt


BUGS

     Since makecpt will also interpolate from any  existing  .cpt
     file  you  may have in your directory, you cannot use one of
     the listed cpt  names  as  an  output  filename;  hence  the
     my_gebco.cpt in the example.


SEE ALSO

     gmt(l), grd2cpt(l)