xycpt (1) Linux Manual Page
NAME
xycpt – generate GMT colour palette table (cpt) files from column data.
SYNOPSIS
-
xycpt[-brgb] [-d] [-f rgb] [-h] [-n rgb] [-o file] [-r registration] [-u] [-v] [-V] [file]
DESCRIPTION
xycpt program generates discrete or continuous cpt files from simple input describing sample values of the colour (or greyscale) range. The input consists of 1-4 columns. For 2 and 4 columns, the first column is interpreted as a (double) z value, for 1 and 3 the z value is taken implicitly. For 1 and 2 columns the final column will be taken as a greyscale value. For 3 and 4, the last 3 columns are taken as RGB values.
The program will read from stdin if a file is not specified as the final argument, and write to stdout if the -o 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.
-d, –discrete
- Output a discrete cpt file, the default is continuous.
-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 file
- Write the output to file, rather than stdout.
-r, –registration string
- For discrete (using the
-doption) conversion, specifiesupper,middleorlowerregistration of the data value. For theupperandlowertypes the final (respectively the first) colour is omitted from the output; only the z value is used. Formiddleregistration all the colours appear in the output.
-u, –unit
- Colour values are specified as floating point numbers in the range 0-1 rather than as integers in the range 0-255.
-v, –verbose
- Verbose operation.
-V, –version
- Version information.
AUTHOR
J.J. Green
SEE ALSO
GMT(1).