Provides a low-level interface to the image/color/palette package.
Package palette provides standard color palettes.
ConstantsConstants are variables with :const true in their metadata. Joker currently does not recognize them as special; as such, it allows redefining them or their values.
Plan9 is a 256-color palette that partitions the 24-bit RGB space
into 4×4×4 subdivision, with 4 shades in each subcube. Compared to the
WebSafe, the idea is to reduce the color resolution by dicing the
color cube into fewer cells, and to use the extra space to increase the
intensity resolution. This results in 16 gray shades (4 gray subcubes with
4 samples in each), 13 shades of each primary and secondary color (3
subcubes with 4 samples plus black) and a reasonable selection of colors
covering the rest of the color cube. The advantage is better representation
of continuous tones.
This palette was used in the Plan 9 Operating System, described at
WebSafe is a 216-color palette that was popularized by early versions
of Netscape Navigator. It is also known as the Netscape Color Cube.
See https://en.wikipedia.org/wiki/Web_colors#Web-safe_colors for details.
Functions, Macros, and Special Forms