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I'm trying to get the hang of how colors combine, however I have yet to really understand combining additive and subtractive colors. I'd like to take the next step on painting the figure I'm doing currently, however, so I though I would see if anyone could help me out with this particular case.
If I'm trying to represent green light being projected from a source and reflected off of a red surface... what color should I paint the surface? I'm not sure if I'd want to use a brown, a yellow, or simply ignore all of this and paint it green. Some explaination (don't be afraid to pull out some math or physics if needed) as to why the color would work out that way would be nice.
You play your game, I'll play mine.
Hmmm, I would be tempted to do this one of two ways;
1. Very very lightly drybrush your shades of green over the surface to 'glow', with the dark covering a larger area than the light.
2. Use a very thin wash, with the area getting smaller as you layer towards the brightest bits.
I have only done no. 1, because it was the underside of a vehicle, but if it is anything but armour, idea 2 may work better.
Beware the Agapanthers!
Codex Astartes: More a guideline than a rule...
A red surface reflects (mostly) light from the red spectrum. If you only shine light from the green spectrum on it it will not reflect anything (or very little) and thus be black. It might not be very exciting but there you have it
Green light does not reflect off a red surface.
And over there we have the labyrinth guards.
One always lies, one always tells the truth, and one stabs people who ask tricky questions.
So, disregarding the facts (because not everything MUST be logical) paint the reflection green.
This is only in the case of the adsence of all other light though and very little truely reflects only light from a particular part of the spectrum. If it's a generally non-reflective surface like clothing then a faint tinge of green might be visible where a highly reflective surface like painted armor would reflect the green light much better regardles of the paints color.Originally Posted by Tubal
I took a simplified example of course but a red surface would reflect so little green light that it would be almost unnoticeable if there's another significant source of light (which includes red) nearby.Originally Posted by Plisken
I should have been more precise, I am not considering pure hues/colors (forgive the inexactness of my language.) I'm considering something that is glowing green, reflecting off of a red cloth. Both of these are going to have some bredth to their spectrums.
I went and played around with a red tablecloth and a flashlight with a green plastic cup. When I brought the flashlight close to the tablecloth, it definately became green. At a large distance, I honestly don't remember what happened. At a medium distance, I could not tell if I was looking at green or yellow. I'm going to make some cards with holes in them to try and see if I can't figure out the color that way.
What I'm really trying to figure out is what that medium color should be... I may simply need to experiment, however I was hoping people might have some insight. Obviously, the result will not be red, brown, or black in this situation. I just can't tell if I'm looking at green or yellow.
Hopefully this makes the situation considerably more clear.
You play your game, I'll play mine.
I think that you're following the best course of action by actually trying it and seeing how it looks. Maybe take a photo of it and then you'll be able to see more clearly what color it is or you could try posting the photos and that might give people here a better idea of how they'd achieve it.