Built in colormaps in Matlab

I want a lighter version of the开发者_如何学运维 "cyan" color, using the function colormap('cyan'). How do you do this?

Check out the function BRIGHTEN:

X = spiral(8);
image(X)
colormap(winter), colorbar
brighten(0.6)

Another trick is to right click on the colorbar and select Interactive Colormap Shift, this allows to shift the color-to-data mapping using mouse dragging.

Pure cyan is represented by the RGB triple [0 1 1]. To make it lighter, just increase the red component (ex: [0.5 1 1]), thus moving it closer to pure white ([1 1 1]). If you want to make a colormap that spans from pure cyan through lighter shades of cyan all the way to pure white, you can do the following:

nValues = 128;  %# The number of unique values in the colormap
map = [linspace(0,1,nValues)' ones(nValues,2)];  %'# 128-by-3 colormap

Now you can set the colormap to the one made above using the COLORMAP function:

colormap(map);

For more discussion of colors in MATLAB, check out this link.

For me colormap('cyan') fails because cyan is undefined.

However, you can create your own colors easily. If cyan is equivalent to [0,1,1] a lighter color would be [0,1,1] + [.1,0,0] = [.1,1,1] or rather just increase the R in RGB to increase the luminosity.