NAME

cptpg - convert GMT colour palette tables (cpt) to PostGIS colour-maps.

SYNOPSIS

cptpg [-h] [-o path] [-p] [-v] [-V] [path]

DESCRIPTION

The cptpg utility converts the colour palette table (cpt) files used by GMT to the colour-maps used by PostGIS, in particular those for the ST_ColorMap function. It should also be possible to use the maps in the GDAL program gdaldem, the GRASS r.colors utility and in ESRI products which call for a HDR color table.

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

--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 of plain, xml or json.

--comments-write path

Write the comments in the input to the specified path.

-h, --help

Brief help.

--hinge-active

If the input cpt has a SOFT_HINGE directive, then activate that hinge (resulting in independent scaling of the two halves of the gradient either side of the hinge).

If the input does not have such a directive, then this option has no effect.

-o, --output path

Write the output to path, rather than stdout.

-p, --percentage

Convert (z) values to percentages.

-v, --verbose

Verbose operation.

-V, --version

Version information.

AUTHOR

J.J. Green