查看“︁Template:Shade/bgcolor”︁的源代码

<noinclude>{{code|</noinclude>rgb(<includeonly>{{#expr:</includeonly>({{{r}}}*{{{a}}}+{{{r_bg<includeonly>|255</includeonly>}}}*(1-{{{a}}}))<includeonly>}}</includeonly>,<includeonly>{{#expr:</includeonly>({{{g}}}*{{{a}}}+{{{g_bg<includeonly>|255</includeonly>}}}*(1-{{{a}}}))<includeonly>}}</includeonly>,<includeonly>{{#expr:</includeonly>({{{b}}}*{{{a}}}+{{{b_bg<includeonly>|255</includeonly>}}}*(1-{{{a}}}))<includeonly>}}</includeonly>)<noinclude>}}{{documentation|content=
Calculates an rgba naively blended over a (by default) white background, i.e.
{{block indent|1=
<math>C_o = C_a \alpha + 255 (1 - \alpha)</math>
}}


<pre style="overflow:auto">
{{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) -->
}}
</pre>
}}</noinclude>