How do you plot a line on a function defined by colors?

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Lulu
Lulu 2023-10-19
回答： Walter Roberson 2023-10-19
Hello, I want to plot a line on a color defined function (enclosed example below), such that the line follows the boarders between colors. I don't want to plot a line that roughly follows the color boarders but follows the boarder exactly based on the change in color. However, I am unsure how to acomplish this. Any help appreciated.
Example:
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Lulu
Lulu 2023-10-19
It is an imagesc(). The underlying data has sharp data boudaries.
Dyuman Joshi
Dyuman Joshi 2023-10-19
Could you attach the data? Use the paperclip button to attach.

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回答（3 个）

KSSV
KSSV 2023-10-19
Ran in:
[X,Y,Z] = peaks(100) ;
contourf(X,Y,Z)
Voss
Voss 2023-10-19
Ran in:
img = imread('image.png');
imagesc(img)
hold on
contour(mean(img,3),'k')
Walter Roberson
Walter Roberson 2023-10-19
levels = unique(YourData);
contourf(YourData, levels);

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