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DESCRIPTION
The cptcat utility concatenates GMT colour
palette table (cpt) files. The mandatory path
argument(s) specify the input files which may be specified in any order. However, when sorted,
the maximum (z-value) of the lower file should equal the minimum of the upper file; files can
be modified with the makecpt (1) utility to be in this
form.
The background colour will be taken from that of the lower (or lowest) file, and the forground from that of the upper.
The program will write to stdout if the -o
option is not
specified.
OPTIONS
--backtrace-file
path
-
Specify a file to which to write a formatted backtrace. The file will only be created if there is a backtrace created, typically when an error occurs.
--backtrace-format
format
-
Specify the
format
of the backtrace written to the files specified by--backtrace-file
, one ofplain
,xml
orjson
. -h
,--help
-
Brief help.
-H
,--hinge-hard
-
Adds a
HARD_HINGE
to the ouput, see HINGES below. -S
,--hinge-soft
-
Adds a
SOFT_HINGE
to the ouput, see HINGES below. -o
,--output
path
-
Write the output to
path
, rather thanstdout
. -v
,--verbose
-
Verbose operation.
-V
,--version
-
Version information.
-z
,--z-normalise
-
Normalise the z-values in the cpt output into the range 0/1 (or to -1/1 if a hinge is present) and add a
RANGE
directive if not present in the input. This is the form used in GMT master files.This option requires that output cpt version is at least 5.
-Z
,--z-denormalise
-
Set the z-values in the cpt output into the range given by the
RANGE
directive, and remove that directive. If there is noRANGE
then this option does nothing. -4
,--gmt4
-
Use GMT 4 conventions when writing the cpt output: the colour-model code is uppercase, and the colours are separated by spaces.
This is incompatible with the
-5
and-6
options of course.At present this option is the default, but that will change at some point. So specify this option if your use of the output depends on the GMT 4 layout (consumed by a custom parser, for example).
-5
,--gmt5
-
Use GMT 5 conventions when writing the cpt output: the colour-model code is lowercase, and the colours are separated by a solidus for RGB, CMYK, by a dash for HSV.
This is incompatible with the
-4
and-6
options of course. -6
,--gmt6
-
As the
-5
option, but allows theHARD_HINGE
andSOFT_HINGE
directives in place of the explicitHINGE =
directive.This is incompatible with the
-4
and-5
options of course.
HINGES
The treatment of hinges in this program is rather different to that of the other programs reading and writing the cpt format, those retain the hinge (if any) found in the input.
However, an expected use-case for this program is to combine bathymetry and topography schemes, which would typically not have hinges, producing a bathymetry-topography scheme, which typically would.
Hence any hinges in the input will be ignored (a warning will be issued in this case), and
the output will have a hinge only if one of the --hinge-hard
(-H
) or --hinge-soft
(-S
) options are given. These are a recent GMT feature, so the --gmt6
option is required.