I've consistently noticed in pictures of double-slit interference when very low-light or one photon at-a-time is used, that there's lots of "stray" photons detected in the areas of destructive interference. That is to say, the pattern still emerges, but less "cleanly" than one might expect. 

On the other hand, from all the representations I've seen, it's my understanding that in the original "normal intensity light" version of the double-slit, the areas of destructive interference can be made to at least appear completely devoid of light.

I'm aware that the difference might have an easy explanation if it's true. But that's my question...is it true? Have you noticed the difference that I speak of, or am I just imagining things?