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 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.
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 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. 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].
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(1gmt),
grd2cpt(1gmt)