How do I use graythresh on an indexed image in MATLAB?

 The graythresh function in MATLAB is used to determine the threshold level for a grayscale image, but it cannot be used directly on an indexed image. To use graythresh on an indexed image, you need to first convert the indexed image to a grayscale image.

Here's an example of how to use graythresh on an indexed image in MATLAB: 

 

% Load an indexed image
[X,map] = imread('example.tif');

% Convert the indexed image to a grayscale image
I = ind2gray(X,map);

% Use graythresh to determine the threshold level
level = graythresh(I);

NOTE:-

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