I chose as an example a familiar figure!
img = Import["Lena.jpg"];
Now let's confine her inside a frame
S0 = Show[img, Frame -> True]
Mathematica decides (I don't know how) to range the frame from 0 to about 300.
Is there a way to change the default range of the frame?
(a). A square frame like PlotRange -> {{-n,n},{-n,n}}
(b). A random frame with PlotRange -> {{a,b},{c,d}}
Many thanks in advance!