How to read .tif as .mat file?

I tried to read my .tif file as .mat and my fixed model didn't accept it. Is there something wrong in this code?

if true
load z.mat
z=double(imread(z.tif));
% code
end

Answer 1

[Marc Jakobi]

Not sure what you are trying to do. Do you have a .tif file called z.tif? Then the solution would be to specify the .tif file as a string:

z = double(imread('z.tif'));