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colorcet:CET_R4#

Aliases: colorcet:r04, colorcet:r4, colorcet:rainbow4, colorcet:rainbow_bgyr_10_90_c83_n256

Rainbow colour map from blue to red. Note there is a small perceptual blind spot at yellow

collection category license authors source
colorcet Miscellaneous CC-BY-4.0 Peter Kovesi https://colorcet.com 
from cmap import Colormap

cm = Colormap("colorcet:CET_R4")  # case insensitive

import matplotlib.pyplot as plt
from cmap import Colormap

plt.imshow(data, cmap=Colormap("colorcet:CET_R4").to_mpl())

import plotly.express as px
from cmap import Colormap

px.imshow(data, color_continuous_scale=Colormap("colorcet:CET_R4").to_plotly())

import napari
from cmap import Colormap

napari.imshow(data, colormap=Colormap("colorcet:CET_R4").to_napari())
napari.run()

background: #04006C;
background: linear-gradient(90deg, #04006C 0%, #040085 3.22581%, #05019E 6.45161%, #080AB3 9.67742%, #0C1AC3 12.9032%, #0F27D3 16.129%, #1133E3 19.3548%, #1540EF 22.5806%, #1F55E6 25.8065%, #176DC5 29.0323%, #09819F 32.2581%, #289171 35.4839%, #319F3F 38.7097%, #3FAB15 41.9355%, #5EB406 45.1613%, #7BBD05 48.3871%, #95C504 51.6129%, #AFCE03 54.8387%, #C7D602 58.0645%, #DFDD02 61.2903%, #F3DD04 64.5161%, #FAD10A 67.7419%, #FBC00F 70.9677%, #FCAF13 74.1935%, #FC9E15 77.4194%, #FC8B15 80.6452%, #FD7612 83.871%, #FE5E0F 87.0968%, #FE420D 90.3226%, #F5280D 93.5484%, #E7180D 96.7742%, #D7050D 100%);

import altair as alt
from cmap import Colormap

# df: a DataFrame with columns x, y and value
alt.Chart(df).mark_rect().encode(
    x="x:O",
    y="y:O",
    color=alt.Color(
        "value:Q", scale=alt.Scale(range=Colormap("colorcet:CET_R4").to_altair())
    ),
)

from bokeh.plotting import figure, show
from cmap import Colormap

p = figure()
p.image(
    image=[data], x=0, y=0, dw=1, dh=1,
    color_mapper=Colormap("colorcet:CET_R4").to_bokeh(),
)
show(p)

from vispy import app, scene
from cmap import Colormap

canvas = scene.SceneCanvas(show=True)
view = canvas.central_widget.add_view()
scene.visuals.Image(data, cmap=Colormap("colorcet:CET_R4").to_vispy(), parent=view.scene)
view.camera = scene.PanZoomCamera(aspect=1)
view.camera.set_range()
app.run()

import pygfx as gfx
from cmap import Colormap

image = gfx.Image(
    gfx.Geometry(grid=gfx.Texture(data, dim=2)),
    gfx.ImageBasicMaterial(
        clim=(data.min(), data.max()), map=Colormap("colorcet:CET_R4").to_pygfx()
    ),
)
gfx.show(image)

import pyqtgraph as pg
from cmap import Colormap

view = pg.image(data)
view.setColorMap(Colormap("colorcet:CET_R4").to_pyqtgraph())
pg.exec()

import ee
from cmap import Colormap

ee.Initialize(project="my-project")  # your Google Cloud project
elevation = ee.Image("CGIAR/SRTM90_V4")
image = elevation.visualize(
    min=0, max=3000, palette=Colormap("colorcet:CET_R4").to_gee()
)

See also usage with external libraries.

colorcet:CET_R4colorcet:CET_R4 colormap
colorcet:CET_R4colorcet:CET_R4 colormap

Perceptual lightness#

Lightness (J′) measured in CAM02 Uniform Color Space (CAM02-UCS)

RGB components#

Hue & saturation#