Tags: faq plotting

Which colormaps are supported?

FieldTrip includes a helper-function ft_colormap with which you can select any of the standard MATLAB colormaps, but also those of Matplotlib, Brewermap, CMOcean and ColorCET.

You can use ft_colormap just like you would the standard MATLAB colormap function. Furthermore, most plotting functions support the option cfg.colormap with which you can specify the desirec colormap.

The following sections of code loop through a large number of the available colormaps.

MATLAB

cmap = {'parula', 'jet', 'hsv', 'hot', 'cool', 'spring', 'summer', 'autumn', 'winter', 'gray', 'bone', 'copper', 'pink', 'lines', 'colorcube', 'prism', 'flag'};
figure
set(gcf, 'Name', 'matlab')
for i=1:length(cmap)
  subplot(length(cmap),1,i)
  rgb = ft_colormap(cmap{i});
  image(reshape(rgb, [1 64 3]))
  axis off
  text(65, 1, cmap{i})
end

Matplotlib

cmap = {'cividis', 'inferno', 'magma', 'plasma', 'tab10', 'tab20', 'tab20b', 'tab20c', 'twilight', 'viridis'};
figure
set(gcf, 'Name', 'matplotlib')
for i=1:length(cmap)
  subplot(length(cmap),1,i)
  rgb = ft_colormap(cmap{i});
  image(reshape(rgb, [1 64 3]))
  axis off
  text(65, 1, cmap{i})
end

Brewermap

cmap = {'BrBG', 'PRGn', 'PiYG', 'PuOr', 'RdBu', 'RdGy', 'RdYlBu', 'RdYlGn', 'Spectral', 'Accent', 'Dark2', 'Paired', 'Pastel1', 'Pastel2', 'Set1', 'Set2', 'Set3', 'Blues', 'BuGn', 'BuPu', 'GnBu', 'Greens', 'Greys', 'OrRd', 'Oranges', 'PuBu', 'PuBuGn', 'PuRd', 'Purples', 'RdPu', 'Reds', 'YlGn', 'YlGnBu', 'YlOrBr', 'YlOrRd'};
figure
set(gcf, 'Name', 'brewermap')
for i=1:length(cmap)
  subplot(length(cmap),1,i)
  rgb = ft_colormap(cmap{i});
  image(reshape(rgb, [1 64 3]))
  axis off
  text(65, 1, cmap{i})
end

CMOcean

cmap = {'thermal', 'haline', 'solar', 'ice', 'gray', 'oxy', 'deep', 'dense', 'algae', 'matter', 'turbid', 'speed', 'amp', 'tempo', 'rain', 'phase', 'topo', 'balance', 'delta', 'curl', 'diff', 'tarn'};
figure
set(gcf, 'Name', 'cmocean')
for i=1:length(cmap)
  subplot(length(cmap),1,i)
  rgb = ft_colormap(cmap{i});
  image(reshape(rgb, [1 64 3]))
  axis off
  text(65, 1, cmap{i})
end

ColorCET

cmap = {'blueternary', 'coolwarm', 'cyclicgrey', 'depth', 'divbjy', 'fire', 'geographic', 'geographic2', 'gouldian', 'gray', 'greenternary', 'grey', 'heat', 'phase2', 'phase4', 'rainbow', 'rainbow2', 'rainbow3', 'rainbow4', 'redternary', 'reducedgrey', 'yellowheat'};
figure
set(gcf, 'Name', 'colorcet')
for i=1:length(cmap)
  subplot(length(cmap),1,i)
  rgb = ft_colormap(cmap{i});
  image(reshape(rgb, [1 64 3]))
  axis off
  text(65, 1, cmap{i})
end

Cyclic copormaps for phase plots

To plot phase color-coded, you need a colormap that starts and ends at the same color. Some of the colormaps that can be used are hsv, phase, phase2, phase4, and cyclicgrey. You can check these yourself using the following code.

% construct linearly increasing angles that wrap twice
a = [linspace(-pi, pi) linspace(-pi, pi) linspace(-pi, pi)]

figure
plot(a)

figure
imagesc(a)
ft_colormap phase