The  Alfred Hitchcock " Miniatures and matte painting"
 

Rope (1948)

The background miniature paintings changes from day light to night, through a dramatic red nightfall with moving clouds. Probably made by scenic and miniature artists from Warner Bros Studios. Mario Larrinaga and Paul Detlefsen worked for W. B. during the 40´S. Larrinaga had already execute some huge cityscape paintings for King Kong (1933) at RKO, so he could have done that backdrop painting.