This is to help sticker/decal makers who are looking for accurate RGB Values for Lego's colors. This list is in no way complete, but I'm hoping it will help somebody. I'll update this as I get more information.
Color Name...R, G, B
Yellow …253, 196, 0
Orange…231, 98, 23
Red…222, 0, 13
Dark Red…128, 8, 27
Blue…0, 86, 168
Baby Blue…134, 192, 234
Sand Blue…94, 116, 139
Dark Blue…0, 36, 65
Green…0, 122, 40
Lime Green…148, 184, 10
Bright Green…0, 149, 35
Sand Green…95, 130, 100
Dark Green…0, 52, 22
Brown…91, 28, 12
Tan…217, 186, 122
Dark Tan…141, 116, 82
Dark Brown…47, 14, 5
Flesh…245, 193, 136
White…244, 244, 244
Dark Bley…75, 81, 85
Black…1, 1, 1