Providing perceptually exact sequential and cyclic continuous colormaps and nonmisleading qualitative colorschemes from matplotlib. More info can be found in matplotlib official docs, or in the original video presentation (a very enjoyable watch!).
Note that the package delivers only a subset of all matplotlib's colorscheme, namely those that have been originally developed by its team. If you are looking for Paired or RdBu, etc... you might want to check the BREWER colormap package. Same goes for CubeHelix and cmocean.
% View a PHOTO with matplotlib default colormap
S = load('mandrill');
imshow(S.X,palette.viridis)
% Graph a surface with the twilight cyclic colormap
[X,Y,Z] = peaks(50);
surfc(X,Y,Z)
colormap(palette.twilight_shifted) % shifted to have white at zero
% A trick to deal with nasty CONTOURCMAP function (Mapping Toolbox):
preset_palette(@palette.viridis); % preselect the colorscheme.
load topo
load coastlines
figure
worldmap(topo, topolegend);
contourfm(topo, topolegend);
plotm(coastlat, coastlon, 'k');
contourcmap('preset_palette', 'Colorbar','on', 'Location','horizontal',...
'TitleString','Contour Intervals in Meters'); % Et Voilà...
% -> we have applied the viridis colormap through the preset function!
% Plot and compare RGB values:
ax(1) = subplot(1,2,1);
cmap = palette.viridis;
rgbplot(cmap); title('viridis');
xlim([0,256]); xticks([]);
colorbar('southoutside');
colormap(ax(1),cmap);
ax(2) = subplot(1,2,2);
cmap = palette.plasma;
rgbplot(cmap); title('plasma');
xlim([0,256]); xticks([]);
colorbar('southoutside');
colormap(ax(2),cmap); 
% Multiline plot using matrices:
N = 6;
axes('ColorOrder',palette.tab10,'NextPlot','replacechildren')
X = linspace(0,pi*3,1000);
Y = bsxfun(@(x,n)n*sin(x+2*n*pi/N), X.', 1:N);
plot(X,Y, 'linewidth',4); box on; xlim([0,3*pi]);
% Multiline plot in a loop:
set(0,'DefaultAxesColorOrder',palette.tab20)
N = 6;
X = linspace(0,pi*3,1000);
Y = bsxfun(@(x,n)n*sin(x+2*n*pi/N), X.', 1:N);
for n = 1:N
plot(X(:),Y(:,n), 'linewidth',4);
hold all
end
xlim([0,3*pi]);
PRESET_PALETTE is a wrapper for any colormap function, storing the function and any parameter values for future calls.
preset_palette(@palette.magma)
colormap(preset_palette)© 2022, Stephen Cobeldick, Gabriele Bellomia
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