makecpt - Make GMT color palette tables


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


      makecpt is a utility that will help you make color palette tables (cpt
      files).  You define an equidistant set of contour intervals 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.


      -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.  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].


      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


      gmt, grd2cpt

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