## 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 -Cblue2red -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 > gebco.cpt

## SEE ALSO

          gmt, grd2cpt