Colorspec

Many commands allow you to specify a linetype with an explicit color. This option is only possible for terminals that support RGB color or pm3d palettes.

Syntax:

     ... {linetype | lt} <colorspec>

where 5#5colorspec6#6 has one of the following forms:

     rgbcolor "colorname"
     rgbcolor "#RRGGBB"
     rgbcolor variable
     palette frac <val>      # <val> runs from 0 to 1
     palette cb <value>      # <val> lies within cbrange
     palette z

"colorname" refers to one of the color names built in to gnuplot. For a list of the available names, see show palette colornames (p. ).

"#RRGGBB" is a hexadecimal constant preceded by the "#" symbol. The RRGGBB represents the red, green, and blue components of the color, each on a scale from 0 - 255. For example, magenta = full-scale red + full-scale blue would be represented by #FF00FF, which is the hexadecimal representation of (255 5#55#5 16) + (0 5#55#5 8) + (255).

"rgb variable" requires an additional column in the using specifier, and is only available in 3D plotting mode (splot). The extra column is interpreted as a 24-bit packed RGB triple. These are most easily specified in a data file as hexidecimal values (see above).

Example:

     rgb(r,g,b) = 65536 * int(r) + 256 * int(g) + int(b)
     splot "data" using 1:2:3:(rgb($1,$2,$3)) with points lc rgb variable

The color palette is a linear gradient of colors that smoothly maps a single numerical value onto a particular color. Two such mappings are always in effect. palette frac maps a fractional value between 0 and 1 onto the full range of the color palette. palette cb maps the range of the color axis onto the same palette. See set cbrange (p. ). See also set colorbox (p. ). You can use either of these to select a constant color from the current palette.

"palette z" maps the z value of each plot segment or plot element into the cbrange mapping of the palette. This allows smoothly-varying color along a 3d line or surface. This option applies only to 3D plots (splot).