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 contour intervals or pass your own z-table, and  create  a  new  cpt
       file based on an existing master cpt file. The resulting 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 existing
              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. Alternatively, 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 discontinuous, 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(1gmt), grd2cpt(1gmt)

                                            1 Jan 2004                                 MAKECPT(l)