Hmm... well, I see it yellow.

I took the images and looked at their pixels colours. In the third image the most illuminated areas on both wall and floor are 255,255,0 while the less illuminated areas of the wall are 177,172,0 (it's an approximate value, since it varies a bit from a pixel to next) which is a dark yellow.

And in the first image the full wall is 143,143,0 which is clearly dark yellow.