[TexasGator]

Wiki: purple

In optics, violet is a spectral color; it refers to the color of any different single wavelength of light on the short wavelength end of the visible spectrum, between approximately 380 and 450 nanometers,[58] whereas purple is the color of various combinations of red, blue, and violet light,

[GingisK]

Some colors seem to be formed by dithering as well.

[Jamestown1630]

Maybe you should give it up, now...You've made your point ad infinitum.

[dayglored]

I have followed your (plural) argument with some interest, waiting for one of you to mention an extremely important point about color as perceived by the human eye.

Namely, the profound difference between Transmitted and Reflected colors.

Transmitted color is when the primary source of the light hits the eyeball directly, without reflection off an object.

Reflected color is when we view an object that is being illuminated by a source, but we're not looking at the source's light directly.

Example:

• A green LED, or a TV/computer screen showing green. The eye perceives "green" because that is what the source is generating. This is how transmission light sources work.

• Green grass, or a green painted wall. The eye perceives "green" because the object has absorbed every wavelength except the green ones, so what you see is the light that was not absorbed by the object. That is how paint pigments and other reflective objects work.

The reason this difference is profound is that one is "additive" and the other is "subtractive". Which is why (now read carefully):

When you combine all the colors of the spectrum together, if you do it with light sources, you get WHITE. But if you combine all the colors of the spectrum together using pigments (paint), you get BLACK.

So before you two make us all any crazier, please address that in your discussion of how colors combine. It's an essential factor that appears to be missing in this thread.

[nopardons]

Yet their example of VIOLET is actually PURPLE!

And PLEASE do NOT argue with me about THAT! They either used the wrong color, or they are misusing the term "VIOLET". I'm extraordinarily good with color; names, shades, etc.! I have and have had many different brands of watercolors throughout my life and sometimes the same color, from two or more different manufacturers, are NOT exactly the same. And I know WHY, but that doesn't really matter re this discussion.