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  mas-
       ter cpt, and can be made continuous or discrete.


OPTIONS

       -C     Selects  the  master  color table table to use in the interpola-
              tion.  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(l), grd2cpt(l)



VERSION                              DATE                           MAKECPT(l)

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