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MAKECPT(1)                   Generic Mapping Tools                  MAKECPT(1)

NAME
       makecpt - Make GMT color palette tables

SYNOPSIS
       makecpt [ -Ctable ] [ -D ]  [ -I ] [ -M ] [ -N ] [ -Q[i|o] ] [
       -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.
       The color palette includes three additional colors beyond the range of
       z-values. These are the background color (B) assigned to values lower
       than the lowest z-value, the foreground color (F) assigned to values
       higher than the highest z-value, and the NaN color (N) painted
       whereever values are undefined.
       If the master cpt file includes B, F, and N entries, these will be
       copied into the new master file.  If not, the parameters
       COLOR_BACKGROUND, COLOR_FOREGROUND, and COLOR_NAN from the
       .gmtdefaults4 file or the command line will be used. This default
       behavior can be overruled using the options -D, -M or -N.
       The color model (RGB, HSV or CMYK) of the palette created by makecpt
       will be the same as specified in the header of the master cpt file.
       When there is no COLOR_MODEL entry in the master cpt file, the
       COLOR_MODEL specified in the .gmtdefaults4 file or on the command line
       will be used.

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 cpt file
              [Default gives a rainbow cpt file].

       -D     Select the colors for lowest and highest z-values in the output
              cpt file as the back- and foreground colors that will be written
              to the cpt file [Default uses the colors specified in the master
              file, or those defined by the parameters COLOR_BACKGROUND,
              COLOR_FOREGROUND, and COLOR_NAN].

       -I     Reverses the sense of color progression in the master cpt file.
              Also exchanges the foreground and background colors, including
              those specified by the parameters COLOR_BACKGROUND and
              COLOR_FOREGROUND.

       -M     Overrule background, foreground, and NaN colors specified in the
              master cpt file with the values of the parameters
              COLOR_BACKGROUND, COLOR_FOREGROUND, and COLOR_NAN specified in
              the .gmtdefaults4 file or on the command line.  When combined
              with -D, only COLOR_NAN is considered.

       -N     Do not write out the background, foreground, and NaN-color
              fields [Default will write them].

       -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
              colors, and writes out z.

       -T     Defines the range of the new cpt file 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 cpt file 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:

       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 -C gebco > 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(1), grd2cpt(1)

GMT 4.5.14                        1 Nov 2015                        MAKECPT(1)