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MAKECPT(1gmt) | Generic Mapping Tools | MAKECPT(1gmt) |
NAME¶
makecpt - Make GMT color palette tablesSYNOPSIS¶
makecpt [ -Ctable ] [ -D ] [ -I ] [ -M ] [ -N ] [ -Q[i|o] ] [ -Tz0/z1/dz | -T ztable ] [ -V ] [ -Z ]DESCRIPTION¶
makecpt is a utility that will help you make color palette tables (cpt files). You define an equidistant set of contour intervals or pass your own z-table, and create a new cpt file based on an existing master cpt file. The resulting cpt file can be reversed relative to the master cpt, and can be made continuous or discrete.OPTIONS¶
- -C
- Selects the master color table table to use in the interpolation. Choose among the built-in tables (type makecpt to see the list) or give the name of an existing cpt file [Default gives a rainbow cpt file].
- -D
- Select the colors for lowest and highest z-values in the output cpt file as the back- and foreground colors that will be written to the cpt file [Default uses the colors specified in the master file, or those defined by the parameters COLOR_BACKGROUND, COLOR_FOREGROUND, and COLOR_NAN].
- -I
- Reverses the sense of color progression in the master cpt file. Also exchanges the foreground and background colors, including those specified by the parameters COLOR_BACKGROUND and COLOR_FOREGROUND.
- -M
- Overrule background, foreground, and NaN colors specified in the master cpt file with the values of the parameters COLOR_BACKGROUND, COLOR_FOREGROUND, and COLOR_NAN specified in the .gmtdefaults4 file or on the command line. When combined with -D, only COLOR_NAN is considered.
- -N
- Do not write out the background, foreground, and NaN-color fields [Default will write them].
- -Q
- Selects a logarithmic interpolation scheme [Default is linear]. -Qi expects input z-values to be log10(z), assigns colors, and writes out z [Default]. -Qo takes log10(z) first, assigns colors, and writes out z.
- -T
- Defines the range of the new cpt file by giving the lowest and highest z-value and the interval. Alternatively, give the name of a ASCII file that has one z-value per record. If not given, the existing range in the master cpt file will be used intact.
- -V
- Selects verbose mode, which will send progress reports to stderr [Default runs "silently"].
- -Z
- Creates a continuous cpt file [Default is discontinuous, i.e. constant colors for each interval].
EXAMPLES¶
To make a cpt file with z-values from -200 to 200, with discrete color changes every 25, and using a polar blue-white-red colortable:BUGS¶
Since makecpt will also interpolate from any existing .cpt file you may have in your directory, you cannot use one of the listed cpt names as an output filename; hence the my_gebco.cpt in the example.SEE ALSO¶
GMT(1), grd2cpt(1)15 Jul 2011 | GMT 4.5.7 |