Save several images with the same colormap

Question

Haimon 2014-6-2

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132156-save-several-images-with-the-same-colormap

评论： Haimon 2014-6-4

Here is my problem:

I have N matrixes generated on MatLab (N could be 1, 100, 1000, etc). How I generated them and why is not important.

I want to save those matrixes as images, with names in a sequence.

So at first I showed them to me using this code:

figure;

image(rho); #rho is the name of the matrix with all variables

colormap(hsv(ceil((rhomax-rhomin))));

cbh = colorbar('location', 'SouthOutside');

set(cbh, 'Units', 'normal', 'Xtick',0:0.5:ceil(rhomax));

text(2.5, -1, 'Densidade(g/cm³)', 'Parent', cbh);

And I got this:

I then tried to save those images using this part of a code.

r = sprintf('rho%04d.tif',d);

imwrite(rho,hsv((ceil(rhomax-rhomin))),r,'tif')

I use 'd' so I can later save another image with a number inside a sequence, for example, rho0001, rho0002, and so on.

And I got this:

As you can probably see, they are different, but they shouldn't be, because I'm using the same map - or, at least, I think I am.

So I think there is probably three possible answers to this problem:

1 - save the figures, with colorbars.

2 - find a colorbar to the second one

3 - solve this "puzzle" and have them be the same in the end.

Does anyone know how to do any of those 3? I don't know how to save those images with colorbars automatically. I also don't know how to find a colorbar for the 2nd image. And I'm still trying to figure out why those two images are different.

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Answer 1

Image Analyst 2014-6-2

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/132156-save-several-images-with-the-same-colormap#answer_139228

if rho changes, hsv((ceil(rhomax-rhomin))) (your colormap) will change. Does that explain it?

To save the figures you can use export_fig() or getframe().

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Haimon 2014-6-3

As of last time, the files are still big, so here is the link to a dropbox folder again:

https://www.dropbox.com/sh/4v66ly0m0ciezj2/AAAJ75GUFtcDSvcavp7KktMoa

One thing:

- the rho1 is the matrix after imshow, and rho2 is the matrix after imwrite. I also put in the folder the corresponding images for figure/colormap, imshow and imwrite, for the sake of comparison.

Haimon 2014-6-4