Making two different color maps in 2014b
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I'm trying to figure out how to use two different color maps in 2014b and use multiple color bars. Specifically I want to plot some image data and on top of that plot a set of contours.
Basically in the past I used freezecolors and cbfreeze. The same method behind freezecolors still works, changing the CData of your image to RGB values, but the colorbar is still a problem. CBfreeze doesn't seem to work any more because the colorbar objects are no long structs and now are specific objects.
I want to have separate colorbars for both the image data and contours but I can't seem to figure out the issue with the colorbars.
Thanks,
John
3 个评论
Jorge Ramirez
2014-11-18
I have the same question/problem. I am attaching a figure of what I could do before 2014b using freezeColors and cbfreeze. However, cbfreeze does not seem to work in 2014b. Thank you.
Adam
2014-11-19
Wow, I'd never noticed R2014b snuck in that change. It's something I've wanted for quite a while, but must have missed in the changes listings!
采纳的回答
Sean de Wolski
2014-11-18
编辑:Sean de Wolski
2014-11-18
You can still use the freezecolors approach or one like I use in my meshCanopy function (same idea). You'll need to set the 'Limits' property of the colorbar to the range you want (and perhaps the tick/ticklabel etc.). For example:
I = imread('cameraman.tif');
n = 64;
meshCanopy(I,stdfilt(I),parula(n),80);
h = colorbar;
%%Now compare
h.Limits = [256 256+n];
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更多回答(4 个)
Nash Chu
2016-9-23
编辑:Nash Chu
2016-9-23
Actually you just need to add 'gca' when you define your colormap. like this:
figure
subplot(2,1,1)
pcolor(x,y,pxy);shading interp;
colormap(gca,jet);
colorbar;
subplot(2,1,2)
pcolor(x,y,pxy);shading interp;
colormap(gca,autumn);
colorbar;
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Steven Lord
2016-9-23
I recommend avoiding using gca in your program files. When experimenting in the Command Window it's okay, but inside a function (and especially inside a GUI) it's too easy for the current axes to change without you realizing it. [As one example you create an axes intending to manipulate it using gca but before you can your user gets a little bored and clicks on a different axes.]
Instead, call subplot with an output argument (which will be the handle of the subplot axes) and pass that handle into colormap.
h = subplot(2, 1, 1);
% stuff
colormap(h, jet);
Jorge Ramirez
2014-11-19
Thank you, Sean. However, the problem is how to add two different colorbars corresponding to the two different colormaps. Your example shows only one colorbar. I am attaching an example graph of what I mean. I produced the attached graph with Matlab 2013b using freezecolors and cbfreeze. However, as I said, cbfreeze does not work anylonger on Matlab 2014b.
Thank you.
Jorge
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Sean de Wolski
2014-11-19
编辑:Sean de Wolski
2014-11-19
In that case just call colorbar twice and change the position as necessary:
I = imread('cameraman.tif');
meshCanopy(I,stdfilt(I),parula(64),80);
ax = gca;
h = colorbar('peer',ax);
h.Limits = [1 256];
h.Ticks = [];
h.Position(1) = h.Position(1)-0.1;
h = colorbar('peer',ax);
h.Limits = [256 256+64];
h.Ticks = [];
Raul
2015-2-17
Still isn't clear how to use two different colormaps. How do you change the colormap?
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