MATLAB: How to change default colormap limits

colorbarcolormapcolormap limits

I am having the problem of changing the limits of a colormap in the plot. When I plotted three plots in the figure I want to change the colormap limits of all the figures. But when I used the caxis the colormap of the last figure is changing but not the others. Is there any way to change the default colormap limits.

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Read about caxis

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MATLAB: Increase RGB image saturation.

This is easier in HSV colorspace:

RGB = rand(100, 100, 3);
HSV = rgb2hsv(RGB);
% "20% more" saturation:
HSV(:, :, 2) = HSV(:, :, 2) * 1.2;
% or add:
% HSV(:, :, 2) = HSV(:, :, 2) + 0.2;
HSV(HSV > 1) = 1;  % Limit values
RGB = hsv2rgb(HSV);

MATLAB: Contourf and colormap limits

The problem is your data goes from [-6.5 8]. The 16 contour lines have been drawn for that. Then when you call caxis, you get rid of any color distinction above 2 or below -2 (>2 all have same color, <-2 all have same color). This does not affect where the actual contor lines go, though. Just the range of values used to assign colors.

Instead, specify (in increasing order) the values you want the contour lines at.

Compare the output of these 3 plots

p = peaks;
figure
contourf(p,16) 
colorbar
figure
contourf(p,16) 
caxis([-2 2])
colorbar
figure
contourf(p,linspace(-2,2,16)) 
colorbar

I think the last one does what you want.

Best Answer

Related Solutions

MATLAB: Increase RGB image saturation.

MATLAB: Contourf and colormap limits

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