Template:Shade/bgcolor
rgb(({{{r}}}*{{{a}}}+{{{r_bg}}}*(1-{{{a}}})),({{{g}}}*{{{a}}}+{{{g_bg}}}*(1-{{{a}}})),({{{b}}}*{{{a}}}+{{{b_bg}}}*(1-{{{a}}})))
Template documentationCalculates an rgba naively blended over a (by default) white background, i.e.
<math>C_o = C_a \alpha + 255 (1 - \alpha)</math>
{{Shade/bgcolor
|r = <!-- red color component: 0-255 -->
|g = <!-- green color component: 0-255 -->
|b = <!-- blue color component: 0-255 -->
|a = <!-- color transparency factor: 0.0-1.0 -->
|r_bg = <!-- red background color component: 0-255 (default=255) -->
|g_bg = <!-- green background color component: 0-255 (default=255) -->
|b_bg = <!-- blue background color component: 0-255 (default=255) -->
}}