Getting Error while using "im2gray" function. I'm using Matlab 2020.

Answer 1

[Jan]

Which Matlab version are you using?

In the documentation: https://www.mathworks.com/help/matlab/ref/im2gray.html you find:

Introduced in R2020b

You find the applied algorithm in the documentation also:

gs = 0.2989 * I(:, :, 1) + 0.5870 * I(:, :, 2) + 0.1140 * I(:, :, 3)

[Md. Mahadi Hasan]

I'm using MATLAB 2020a;

I may fixed it by using "rgb2gray' function instead of "im2gray" function.

I hope both functions are work for same output doesn't it?

[Jan]

Again the documentation tells you, that exactly the same algorithm is used in rgb2gray also.