A spec map, or specular map, is the layer of an item that tells the game how shiny or matte it is. The Sims 4's spec map is broken up into four channels: red, green, blue, and alpha (opacity). Each channel will produce different effects in combination with the others or by itself at different strengths. These matrices were produced by adjusting only one variable at a time and applying it to the t-shirt then seeing how it looks in game and taking a screenshot. The strength of color shown in the background is approximately the color the spec map looked for each shirt. The alpha layer (see top matrix) adds a reflection or sheen at between 12.5% - 87.5% opacity of the colored channels. It’s more liquid looking than metallic and seems most effective at around 50% strength. Green effects the brilliance of the shine making items appear to be made of polished metal. At low opacity, it still implies a metallic quality to an object such as a brushed metal tap. The way that blue ...
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