MATLAB Central Newsreader - Nonlinear colorbar

Nonlinear colorbar

juckou — Mon, 01 Dec 2008 12:42:45 -0500

Dear all

Is it possible to create a colorbar using the pcolor o imagesc functions where the values in the colorbar increase not following a linear progression? I mean, if I have for instance a chlorophyll concentration image and I have its values clustered between 0-1, 1-10 and 10-100, I would like to have the colorbar going from 0 to 1, then from 1 to 10 and finally from 10 to 100 (rather than having a normal one going from 1 to 100 that wouldn't allow to notice differences for concentrations relatively close).

Thanks in advance

juckou

Re: Nonlinear colorbar

juckou — Tue, 02 Dec 2008 00:48:57 -0500

Any suggestions on my previous post? Thank you very much?:

Dear all

Is it possible to create a colorbar using the pcolor or imagesc functions where the values in the colorbar increase not following a linear progression? I mean, if I have for instance a chlorophyll concentration image and I have its values clustered between 0-1, 1-10 and 10-100, I would like to have the colorbar going from 0 to 1, then from 1 to 10 and finally from 10 to 100 (rather than having a normal one going from 1 to 100 that wouldn't allow to notice differences for concentrations relatively close).

Thanks in advance

juckou

Re: Nonlinear colorbar

Paul — Tue, 02 Dec 2008 13:27:01 -0500

juckou <ja79@hw.ac.uk> wrote in message <15340185.1228178968315.JavaMail.jakarta@nitrogen.mathforum.org>...
> Any suggestions on my previous post? Thank you very much?:
>
> Dear all
>
> Is it possible to create a colorbar using the pcolor or imagesc functions where the values in the colorbar increase not following a linear progression? I mean, if I have for instance a chlorophyll concentration image and I have its values clustered between 0-1, 1-10 and 10-100, I would like to have the colorbar going from 0 to 1, then from 1 to 10 and finally from 10 to 100 (rather than having a normal one going from 1 to 100 that wouldn't allow to notice differences for concentrations relatively close).
>
> Thanks in advance
>
> juckou

I would take the logarithm of the concentration and use this as the color scheme.

Re: Nonlinear colorbar

Carlos Adrian Vargas Aguilera — Tue, 02 Dec 2008 14:04:02 -0500

take a look to:

http://www.mathworks.com/matlabcentral/newsreader/view_thread/237071#604527

Carlos