MATLAB: How to transform double to unit8

variable

for i = 1:1:291        %go through rows
    for j = 1:1:240     %columns
        img_heq(i, j) = T(img(i,j));
    end
end
ERROR: Variable img_heq must be of data type uint8. It is currently of type double.
How to recity the varibale error problem.

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