matplotlib.colors.LinearSegmentedColormap#

class matplotlib.colors.LinearSegmentedColormap(name, segmentdata, N=256, gamma=1.0)[source]#

Bases: Colormap

Colormap objects based on lookup tables using linear segments.

The lookup table is generated using linear interpolation for each primary color, with the 0-1 domain divided into any number of segments.

Create colormap from linear mapping segments

segmentdata argument is a dictionary with a red, green and blue entries. Each entry should be a list of x, y0, y1 tuples, forming rows in a table. Entries for alpha are optional.

Example: suppose you want red to increase from 0 to 1 over the bottom half, green to do the same over the middle half, and blue over the top half. Then you would use:

cdict = {'red':   [(0.0,  0.0, 0.0),
                   (0.5,  1.0, 1.0),
                   (1.0,  1.0, 1.0)],

         'green': [(0.0,  0.0, 0.0),
                   (0.25, 0.0, 0.0),
                   (0.75, 1.0, 1.0),
                   (1.0,  1.0, 1.0)],

         'blue':  [(0.0,  0.0, 0.0),
                   (0.5,  0.0, 0.0),
                   (1.0,  1.0, 1.0)]}

Each row in the table for a given color is a sequence of x, y0, y1 tuples. In each sequence, x must increase monotonically from 0 to 1. For any input value z falling between x[i] and x[i+1], the output value of a given color will be linearly interpolated between y1[i] and y0[i+1]:

row i:   x  y0  y1
               /
              /
row i+1: x  y0  y1

Hence y0 in the first row and y1 in the last row are never used.

Examples using `matplotlib.colors.LinearSegmentedColormap`#

Bar chart with gradients

Scatter plots with a legend

Contour Demo

Contour Image

Contourf demo

Contourf and log color scale

Many ways to plot images

Composing Custom Legends

Using a text as a Path

Creating a colormap from a list of colors

Dolphins

Demo CurveLinear Grid2

Shaded & power normalized rendering

Plot contour (level) curves in 3D

Plot contour (level) curves in 3D using the extend3d option

Filled contours

Custom hillshading in a 3D surface plot

3D plots as subplots

3D surface (colormap)

3D surface with polar coordinates

Triangular 3D contour plot

Triangular 3D filled contour plot

More triangular 3D surfaces

Hillshading

Left ventricle bullseye

Topographic hillshading

plot_surface(X, Y, Z)

plot_trisurf(x, y, z)

Customized Colorbars Tutorial

Creating Colormaps in Matplotlib

Colormap normalization

matplotlib.colors.LinearSegmentedColormap#

Examples using matplotlib.colors.LinearSegmentedColormap#

Examples using `matplotlib.colors.LinearSegmentedColormap`#