How can I adjuste the resolution of a .png in an axes environment using GUIDE?

Hi everyone

at the moment, I am designing and implementing a GUI using the GUIDE interface. In the GUI, I need to show a graph I have named example.png . I did this by dragging an axes to the location where I want to place the picture and then went to the according CreateFcn and inserted the following:

if true
axes(hObject);
imshow('example.png'); 
end

I can run the GUI without any problems and it shows the right picture - the resolution, however, looks like MarioKart on the N64, barely identifiable. Does anyone have an idea on how to change that?

Thanks in advance!

Best, Andreas

[A]

any ideas?