Is there anyway to interactively change the color of a data point in an imagesc plot?

Say I had an imagesc plot and wanted to change one of the values from black to white. Is there anyway to do that in the plot itself, or is there any way to maybe use a GUI to allow the user to do that?

Here is the code for reference

nRows = 20;
nCols = 50;
Matrix = zeros(nRows,nCols);
Rndm = randi([0 1],size(Matrix));
imagesc(Rndm)
colormap(gca, gray)

[Walter Roberson]

I take it the question is intended to be about individual points, not about changing the color of all points that are the same value ? Changing the color of all points of a certain value could be accomplished using the colormap editor.

[Alex Weaver]

Yes, just individual points. I wasn’t sure if it was possible or not.

[Walter Roberson]

Well, you could do it with techniques such as first converting your image to rgb using mat2gray() followed by im2uint8() followed by ind2rgb() . After that, you could use ginput() or similar to designate points you wanted to change the color of, and some kind of interface indicating the color you wanted to change to, and store the results in a matrix .

[Alex Weaver]

I don’t have access to a computer at the moment but I will try that tomorrow, thank you!

Answer 1

[Alex Weaver]

That did the trick, thank you for the help!