grd2cpt - Read a grdfile and make a color palette file grd2cpt grdfile [ -C cptmaster ] [ -I ] [ -L minlimit / maxlimit ] [ -S zstart / zstop / zinc ] [ -V ] [ -Z ] grd2cpt reads a grdfile and writes a color palette (cpt) file to standard output. The cpt file is based on an existing master cptfile of your choice, and the mapping from data value to colors is through the data's cumulative distribution function (CDF), so that the colors are histogram equalized. ... S Set steps in cpt file. ...