CPTUPDATE(1) User commands CPTUPDATE(1) NAME cptupdate - create a GMT colour palette table (cpt) file with a different version to the input. SYNOPSIS cptupdate [-b rgb] [-f rgb] [-h] [-H] [-m model] [-n rgb] [-o path] [-S] [-v] [-V] [-z] [-Z] [-4] [-5] [-6] [path] DESCRIPTION The cptupdate program updates the colour palette in the input to a more re- cent (or older) version, optionally adding/removing features to the input. The program reads any version of the format, so can also be used to add hinges or normalise/denormalise version 6 input, or even convert to ver- sions 5 or 4. 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 -b, --background rgb, --no-background Set or remove 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-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. --comments-write path Write the comments in the input to the specified path. --comments-retain Use the comments in the input file as the comments for the output file. --comments-generate Create a comment with summary data (the date of creation, name and ver- sion of the cptutils package) in the output file. -f, --foreground rgb, --no-foreground Set or remove the foreground colour of the output. -h, --help Brief help. -H, --hinge-hard Adds a HARD_HINGE to the output provided the output version is at least 6. -m, --model model On writing the output, convert all colours to the specified model, one of "rgb" or "hsv". This has no effect on non-colour segments. -n, --nan rgb, --no-nan Set or remove the NaN (no data) colour of the output. -o, --output path Write the output to path, rather than stdout. -S, --hinge-soft Adds a SOFT_HINGE to the output provided the output version is at least 6. -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 no RANGE 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 option allows one to downgrade to version 4. If the input is nor- malised it will be denormalised, if the input has hinges, those will be removed. -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 option allows one to downgrade from version 6 (in which case hard/soft hinges will be converted to explicit hinges at zero) or up- grade from version 4. -6, --gmt6 As the -5 option, but allows the HARD_HINGE and SOFT_HINGE directives in place of the explicit HINGE = directive. This option is the default, so redundant (but one might wish to fix version 6 in anticipation later versions of the format). EXAMPLE Update a version 4 cpt to version 6, adding a hard hinge and normalising the result, the typical format for a master file: cptupdate -v -z -H -o new.cpt old.cpt AUTHOR J.J. Green cptutils 1.85 30 September 2025 CPTUPDATE(1)
NAME | SYNOPSIS | DESCRIPTION | OPTIONS | EXAMPLE | AUTHOR
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