Thread:Astarothfan/@comment-27083298-20170621090244/@comment-30924344-20170622174644

Well those are from the LN specifically. Official coloured in B&W images that were included in the special editions of the anime seasons I have noticed are official for 2 reasons:

1. The title of the anime is on the bottom left or right corner.

2. The art style is exactly the same as the colour illustrations from the LN and an artist doesn't use one style then uses a different later.

So the colour versions of B&W images that aren't official are: Issei's BB scene, Xenovia undressing Asia, Rias reuniting with Issei in V12.