Getting size of a browsed image

I want to take the height and width of the inserted (browsed) picture to use the height and width in a condtion

i'm browsing two pictures , i want the them to have the same size

so i already have the first picture , if the of the size of the second one is equal to the first one, then display it

if it's not resize the second picture with the same of the first one and display it

i'm using GUI

That's my code for browisng button , how can i do it ?

% --- Executes on button press in Browse_Image1.
function Browse_Image1_Callback(hObject, eventdata, handles)


[FileName,PathName] = uigetfile({'*.JPg';'*.tif';'*.gif';'*.png'});
filename = fullfile(PathName,FileName);
myImage1 = imread(filename);
gray1=rgb2gray(myImage1);
% get size of the first one 

axes(handles.axes1);
imshow(gray1);

function Browse_Image2_Callback(hObject, eventdata, handles)

if ( Height2 = Height1 && Width2 = Width1) 
    {

[FileName,PathName] = uigetfile({'*.JPg';'*.tif';'*.gif';'*.png'});
filename = fullfile(PathName,FileName);
myImage2 = imread(filename);
gray2 = rgb2gray(myImage2);
axes(handles.axes2);
imshow(gray2);
}
else 
    {
      [FileName,PathName] = uigetfile({'*.JPg';'*.tif';'*.gif';'*.png'});
filename = fullfile(PathName,FileName);
myImage2 = imread(filename);
gray2 = rgb2gray(myImage2);
grayresiz2 = imresize(gray2,[Height1,Width1]);
axes(handles.axes2);
imshow(grayresiz2);  
}