cubehelix(gamma=1.0, s=0.5, r=-1.5, h=1.0)
Unlike most other color schemes cubehelix was designed by D.A. Green to be monotonically increasing in terms of perceived brightness. Also, when printed on a black and white postscript printer, the scheme results in a greyscale with monotonically increasing brightness. This color scheme is named cubehelix because the (r, g, b) values produced can be visualised as a squashed helix around the diagonal in the (r, g, b) color cube.
For a unit color cube (i.e. 3D coordinates for (r, g, b) each in the range 0 to 1) the color scheme starts at (r, g, b) = (0, 0, 0), i.e. black, and finishes at (r, g, b) = (1, 1, 1), i.e. white. For some fraction x, between 0 and 1, the color is the corresponding grey value at that fraction along the black to white diagonal (x, x, x) plus a color element. This color element is calculated in a plane of constant perceived intensity and controlled by the following parameters.
Gamma factor emphasizing either low intensity values (gamma < 1), or high intensity values (gamma > 1).
The starting color.
The number of r, g, b rotations in color that are made from the start to the end of the color scheme. The default of -1.5 corresponds to -> B -> G -> R -> B.
The hue, i.e. how saturated the colors are. If this parameter is zero then the color scheme is purely a greyscale.
Return custom data dictionary of (r, g, b) conversion functions, which can be used with register_cmap
, for the cubehelix color scheme.
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