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RG color models
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<p>An RG color model is a dichromatic <a href="/facts/Color_model/PRcgeJE4">color model</a> represented by <a href="/facts/Red/ETkA7QeX">red</a> and <a href="/facts/Green/gFTac7St">green</a> <a href="/facts/Primary_color/F4wNk0TC">primary colors</a>. These can only reproduce a fraction of the colors possible with a <a href="/facts/Trichromacy/C7I3Ywds">trichromatic</a> color space, such as for human <a href="/facts/Color_vision/j3ou3Izz">color vision</a>. </p><p>The name of the model comes from the initials of the two primary colors: red and green. The model may be either <a href="/facts/Additive_color/RXEDm1hb">additive</a> or <a href="/facts/Subtractive_color/lY5JqRgT">subtractive</a>. </p><p>It was used to display 3D images using anaglyphs since the 1850s. Despite its shortcomings in <a href="/facts/Color_reproduction/xcvGneVA">color reproduction</a>, the RG model was used in early color processes for films from 1906 to 1929 (<a href="/facts/Kinemacolor/yezkYN0b">Kinemacolor</a>, <a href="/facts/Prizma/m023Nptd">Prizma</a>, <a href="/facts/Technicolor/cjULMcyR">Technicolor</a>, <a href="/facts/Brewster_Color/USQmc7FU">Brewster Color</a>, <a href="/facts/Kodachrome/DTw4Xjow">Kodachrome I</a> and <a href="/facts/Raycol/m5xDlp2e">Raycol</a>). </p>