makecpt - Make GMT color palette tables


       makecpt  [ -Ctable ] [ -I ] [ -N ] [ -Q[i|o] ] [ -Tz0/z1/dz | -Tztable]
       [ -V ] [ -Z ]


       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.


       -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.

       -N     Do  Not  write  out  the  background,  foreground, and NaN-color
              fields [Default  will  write  the  parameters  COLOR_BACKGROUND,
              COLOR_FOREGROUND, and COLOR_NAN in your .gmtdefaults4 file.

       -Q     Selects  a logarithmic interpolation scheme [Default is linear].
              -Qi expects input z-values to be log10(z), assigns  colors,  and
              writes  out  z [Default]. -Qo takes log10(z) first, assigns col-
              ors, and writes out z.

       -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].


       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:

       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:

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

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

       makecpt -Cgebco > my_gebco.cpt


       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.


       gmt(l), grd2cpt(l)

GMT4.0                            1 Oct 2004                        MAKECPT(l)

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