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ScottDLS wrote:

Pariah3j wrote:

rotor wrote: Wow, really technical. I would say a sign on a glass door is still a sign. Black technically is the absence of color and yet everyone accepts black as being a contrasting acceptable "color" for a sign.

The Black color spectrum when talking about light spectrum is the absence of light - when talking about physical medium, black is all of the color spectrum combined.

No. WHITE is all the (visible) spectrum combined...

When you are talking about color prism, you are correct. Physical medium, however, behaves almost directly opposite - go buy a paint set and mix all the colors together - you will get black(or pretty darn close) not white.

rotor wrote: Wow, really technical. I would say a sign on a glass door is still a sign. Black technically is the absence of color and yet everyone accepts black as being a contrasting acceptable "color" for a sign.

The Black color spectrum when talking about light spectrum is the absence of light - when talking about physical medium, black is all of the color spectrum combined.