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how to use color sets in maps by defining intervals in matlab (for example: lower than 10 , between 10 and 50 , between 50 and 200, between 200 and 1000, greater than 1000). thanks

Asked by mina massoud on 10 Apr 2019
Latest activity Answered by Kelly Kearney
on 10 Apr 2019
how to use color sets in maps by defining intervals in matlab (for example: lower than 10 , between 10 and 50 , between 50 and 200, between 200 and 1000, greater than 1000). thanks

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2 Answers

Answer by Image Analyst
on 10 Apr 2019
 Accepted Answer

Maybe like
cMap = zeros(1000, 3);
cMap(1:9, :) = [.4, .7, .3]; % Whatever color you want.
cMap(10:50, :) = [.8, .1, .6]; % Whatever color you want.
cMap(50:200, :) = [.6, .37, .8]; % Whatever color you want.
cMap(200:end, :) = [15, .2, .58]; % Whatever color you want.
colormap(cMap);
colorbar;

  2 Comments

thank you for risponding
but i mean if i have a matrix like this
C = [0 2 4 6; 8 10 12 14; 16 18 20 22];
imagesc(C)
colorbar
and i need to put intervals for the value of the matrix
like from [0:4] is a red color
[5:10] is blue color
[11:20] is green color
maggior than 20 is black
for example
thank you
Try this:
C = [0 2 4 6; 8 10 12 14; 16 18 20 21]
imagesc(C)
colorbar
% and i need to put intervals for the value of the matrix
% like from [0:4] is a red color
% [5:10] is blue color
% [11:20] is green color
% maggior than 20 is black
cmap = zeros(22, 3);
cmap(1:5, :) = repmat([1, 0, 0], 5, 1); % 0 to 4 is red
cmap(6:11, :) = repmat([0, 0, 1], 6, 1); % 5 to 10 is blue.
cmap(12:21, :) = repmat([0, 1, 0], 10, 1); % 11 to 20 is green.
cmap(22, :) = [0, 0, 0]; % more than 20 is black.
colormap(cmap);
colorbar;
impixelinfo; % Let user mouse around and see image values.
0000 Screenshot.png

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Answer by Kelly Kearney
on 10 Apr 2019

What are you trying to do with those color intervals? Create a colorbar? Or perhaps a contour plot? If the latter, you can try using my contourfcmap function; it's designed to allow precise color level definition like this.

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