... you did'nt ask it ... right ... you ask nothing ... there is only a statement and a link ...
... but please read my tutorial carefully ...
... you find the solution in tutorial step No. 4 ... "[MOD] Show original image in new window by clicking on image" ...
... and a solution for a window in exact size of the image you find
here ... "[MOD] Bild in Extra-Fenster V.1.2" ...