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
-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
Man(1) output converted with