How to show a colorbar of a certain range?

Hello all and happy Friday!

Let's say I have an image with a colormap and corresponding colorbar

I = imread('cameraman.tif');
imshow(I);
colormap jet
colorbar

I want the colorbar to only show colors for a certain range of values:

range_care = [100 150]; %show colors for values 100:150

Any ideas?

Thanks, plzzzz rply qckly its urgenttt

had to :)

Answer 1

[Titus Edelhofer]

Hi,

something like this:

h = colorbar;
set(h, 'ylim', [100 150])

Titus

[Titus Edelhofer]

sorry, if it wasn't quick enough ;-)

[Sean de Wolski]

That's it, and plenty quick - before third cup of coffee even...

Answer 2

[Sean de Wolski]

In R2014b, this is now possible by setting the limits of the colorbar directly:

surf(peaks)
h = colorbar
h.Limits = [-2 2]

[Image Analyst]

Is that the same as caxis([-2,2])?

[Sean de Wolski]

No. Caxis rescales the colormap so anything below caxis(1) is the minimal color and anything above caxis(2) is the top of the colormap

subplot(1,2,1)
surf(peaks)
h = colorbar;
h.Limits = [-2 2];
title('My original question from grad school')
subplot(1,2,2)
surf(peaks)
h = colorbar;
caxis([-2 2])
title('using caxis')

[Olesia Oh]

so so thanks)

Answer 3

[Maohan Su]

cmap = colormap; %get current colormap
cmap=cmap([min max],:); % set your range here
colormap(cmap); % apply new colormap
colorbar();

Answer 4

[Harsha Vardhan Rao Avunoori]

Okay I don't know whether this is the right one or not.

But I have tried this.

I = imread('cameraman.tif');
imshow(I,'DisplayRange',[100 150]);
colormap jet
colorbar

Hope this is what your looking for.

-Harsha

[Sean de Wolski]

Thank you, but that's not what I'm looking for. That turns everything above 150 to red and everything below 100 to blue. I want the full range of the colormap displayed on the image; just the colorbar showing a fraction of the range.

Answer 5

[Simone Gastaldon]

I have a related problem, I don't know if this is the appropriate place to ask.

I'm plotting multiple sublots (9x2). For each row, the first sublot has a certain colorbar range and the second one has another. Each time I start plotting a new row (say r), the second subplot of the previous row (r-1,2) changes colorbar. I tried freezeColors and related utilities, to no avail. Anyone has advices?