Clear distinction between positive and negative in colorbar

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Gollapalli Prince
Gollapalli Prince 2019-4-22
评论： Rik 2024-2-23
Here I am not able to distinguish between positivie and negative (everything is in green from -1 to +1). Can you please help me giving a different color to some set of values and different colors to another set of values. Screenshot is attached below.
Screenshot 2019-04-22 at 1.09.02 PM.png
I want all negative values to be bluish and darker.
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Rik
Rik 2024-2-12
Ran in:
I would suggest using the top half of viridis and the bottom half of plasma (or the reverse). You can get both of them here.
The benefit is that both colormaps are perceptually uniform, should avoid problems for different types of colorblindness and even allow printing in black&white (or actually grayscale).
Using these two colormaps has the advantage that there is a clear color change in the middle between the two. You could insert a white in the middle, but you shouldn't, since that will cause confusion with the top of the colorbar.
viridis_top = viridis;
viridis_top = viridis_top(1:end/2,:);
plasma_bottom = plasma;
plasma_bottom = plasma_bottom(end/2:end,:);
cmap = [viridis_top;plasma_bottom];
colormap(cmap);
M = peaks(1000);
h = pcolor(M);h.EdgeColor = 'none';
extreme = max(abs(min(M(:))),max(M(:)));
caxis(extreme*[-1,1]) % align colour axis properly
colorbar
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Ahmed
Ahmed 2024-2-22
@Rik thanks, voted, can you plz help to edit the code by including more colors. For example, I want to add more color options in the plot/map.
Rik
Rik 2024-2-23
What exactly do you mean with 'more color options'? And what did you try? You can see in my code how to define a custom colormap and how to set the caxis. What other parts are unclear to you?

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