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    %% Set Subimage File Directory  
% Open a TIFF file and read the value of the |SubIFD| tag in the current
% IFD. The |SubIFD| tag contains byte offsets that specify the location
% of subIFDs in the IFD. The TIFF file should contain subIFDs.   

%%  
t = Tiff('example.tif','r');  

%% 
% Read the value of the SubIFD tag to get subdirectory offsets. 
offsets = getTag(t,'SubIFD');  

%% 
% Set one of the subdirectories (if more than one) as the current directory. 
setSubDirectory(t,offsets(1))
close(t)