function ri_Callback(hObject, eventdata, handles)
% hObject    handle to ri (see GCBO)
% eventdata  reserved - to be defined in a future version of MATLAB
% handles    structure with handles and user data (see GUIDATA)
handles.r =  handles.r -1;
    I= imread('pout.tif');    %picture reading
    imshow(I);
    I(handles.h:handles.r,handles.wid:handles.col,:) = 0;
    I= set(gca,'Position',get(gca,'Position') + [handles.r handles.c 0 0]);   % ????? not working on button
    imshow(I);
    % Update handles structure
    guidata(hObject, handles);

end

I = set(gca,...)

set(gca,...)

set(gca,'Units','Pixels')
set(gca,'Position',...)

I(yoffset+(handles.h:handles.r),xoffset+(handles.wid:handles.col),:) = 0;

I((1:handles.h)+handles.r+yoffset-1,(1:handles.wid)+handles.col+xoffset-1,:) = 0;