Thursday, January 12, 2012

Update to Interesting Shadows


Photography is painting with light but this shadow saga is getting really confusing for somebody like me that doesn’t know too much about modern vapour lights.
I did some searching on the Net and discovered that the lower blue spotlight is most likely mercury vapour light and the orange street light above it is sodium vapour light. OK, not much to it, except: that blue light casts orange shadow and orange light casts blue shadow! I will have to communicate with somebody that designs street lighting to find out why the colors are reversed.

You can see from this projection that higher orange street light’s shadow is in front and blue spotlight’s shadow is in back…

…yet the shadow colors are reversed! Why?!?

2 comments:

Sébastien said...

Might start by checking “Subtractive colors” on the web…

Jerry said...

Exactly what my artistic wife said :).Still, why would subtractive color apply to metal vapour lights?