Graphics::Color::RGB represents a Color in the sRGB color space. Individual color channels are expressed as decimal values from 0 to 1, 0 being a lack of that color (or opaque in the case of alpha) and 1 being full color (or transparent in the case of alpha). If no options are provided then new instance of RGB are opaque white, (that is equivalent to red => 1, green => 1, blue => 1, alpha => 1).
WWW: http://search.cpan.org/dist/Graphics-Color/
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