look at this optical illusion
http://www.michaelbach.de/ot/lum_ade...dow/index.html
the eye cant even determine the tonal value of 2 squares accurately in the same image....
the 2 squares look completely different tonally - but are the same...
look at this optical illusion
http://www.michaelbach.de/ot/lum_ade...dow/index.html
the eye cant even determine the tonal value of 2 squares accurately in the same image....
the 2 squares look completely different tonally - but are the same...