GPLCPT(1) User commands GPLCPT(1) NAME gplcpt - convert GIMP colour palette (gpl) to GMT colour palette table (cpt). SYNOPSIS gplcpt [-b rgb] [-f rgb] [-h] [-n rgb] [-o path] [-v] [-V] [-z] [-4] [-5] [-6] [path] DESCRIPTION The gplcpt program converts GIMP colour palette (gpl) files to the GMT colour palette table (cpt) format. The output is a piecewise constant (step or discrete) gradient. One could use cptcont(1) program to convert the out- put to a continuous cpt file if so desired. The program will read from stdin if a file is not specified as the final argument, and write to stdout if the --output option is not specified. OPTIONS In the following, all rgb specifications should be of the form red/green/blue where the colour components are integers in the range 0 to 255. -b, --background rgb Set the background colour of the output. --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 er- ror occurs. --backtrace-format format Specify the format of the backtrace written to the files specified by --backtrace-file, one of plain, xml or json. --comments-generate Create a comment with summary data (the date of creation, name and ver- sion of the cptutils package) in the output file. --comments-read path Read the comments from the specified path and add them to the output gradient. The format is custom XML which should be fairly easy to generate, see the output of --comments-write for examples. -f, --foreground rgb Set the foreground colour of the output. -h, --help Brief help. -n, --nan rgb Set the NaN (no data) colour of the output. -o, --output path Write the output to path, rather than stdout. -v, --verbose Verbose operation. -V, --version Version information. -z, --z-normalise Normalise the z-values in the cpt output into the range 0/1 and add a RANGE directive. This is the form used in GMT master files. This option requires that output cpt version is at least 5. -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 the HARD_HINGE and SOFT_HINGE directives in place of the explicit HINGE = directive. This is incompatible with the -4 and -5 options of course. AUTHOR J.J. Green SEE ALSO cptcont(1). cptutils 1.85 30 September 2025 GPLCPT(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | AUTHOR | SEE ALSO
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