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 con-
tour intervals or pass your own z-table, and create a new
cpt file based on an existing master cpt file. The result-
ing 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 exist-
ing 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. Alterna-
tively, 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 discontinu-
ous, 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)