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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

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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

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Image Analyst
Image Analyst on 10 Apr 2019
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;

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mina massoud
mina massoud on 10 Apr 2019
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
Image Analyst
Image Analyst on 10 Apr 2019
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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More Answers (1)

Kelly Kearney
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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