How we made the photomontage using Photofiltre 7.2.1
http://www.photofiltre-studio.com/
Télécharger la version française : http://www.photofiltre-studio.com/pf7.htm
Download the english version : http://www.photofiltre-studio.com/pf7-en.htm
Open your original photo with photofiltre and use the polygon selection to delete (cut) the background
Then click on transparency icon, to set white background as transparent
File >Open a new file : the original Leonardo painting
Select and copy your transparent image
Paste your transparent image in the original Leonardo image
Dnipro Ukraine
Lozova, Ukraine
Salvator Mundi
