http://wiki.filipefonseca.pt/index.php?action=history&feed=atom&title=Template%3AShade%2Fbgcolor 2026-04-19T00:59:29Z Revision history for this page on the wiki MediaWiki 1.36.1 http://wiki.filipefonseca.pt/index.php?title=Template:Shade/bgcolor&diff=1566&oldid=prev 2021-07-08T08:32:16Z

<p>1 revision imported</p> <p><b>New page</b></p><div>&lt;noinclude&gt;{{code|&lt;/noinclude&gt;rgb(&lt;includeonly&gt;{{#expr:&lt;/includeonly&gt;({{{r}}}*{{{a}}}+{{{r_bg&lt;includeonly&gt;|255&lt;/includeonly&gt;}}}*(1-{{{a}}}))&lt;includeonly&gt;}}&lt;/includeonly&gt;,&lt;includeonly&gt;{{#expr:&lt;/includeonly&gt;({{{g}}}*{{{a}}}+{{{g_bg&lt;includeonly&gt;|255&lt;/includeonly&gt;}}}*(1-{{{a}}}))&lt;includeonly&gt;}}&lt;/includeonly&gt;,&lt;includeonly&gt;{{#expr:&lt;/includeonly&gt;({{{b}}}*{{{a}}}+{{{b_bg&lt;includeonly&gt;|255&lt;/includeonly&gt;}}}*(1-{{{a}}}))&lt;includeonly&gt;}}&lt;/includeonly&gt;)&lt;noinclude&gt;}}{{documentation|content=<br /> Calculates an rgba naively blended over a (by default) white background, i.e.<br /> {{block indent|1=<br /> &lt;math&gt;C_o = C_a \alpha + C_{bg} (1 - \alpha)&lt;/math&gt;<br /> }}<br /> <br /> The visual properties of a naive (nonlinear) sRGB blend is that color blending with greyscales mostly &quot;work&quot; visually.<br /> &lt;pre style=&quot;overflow:auto&quot;&gt;<br /> {{Shade/bgcolor<br /> |r = &lt;!-- red color component: 0-255 --&gt;<br /> |g = &lt;!-- green color component: 0-255 --&gt;<br /> |b = &lt;!-- blue color component: 0-255 --&gt;<br /> |a = &lt;!-- color transparency factor: 0.0-1.0 --&gt;<br /> |r_bg = &lt;!-- red background color component: 0-255 (default=255) --&gt;<br /> |g_bg = &lt;!-- green background color component: 0-255 (default=255) --&gt;<br /> |b_bg = &lt;!-- blue background color component: 0-255 (default=255) --&gt;<br /> }}<br /> &lt;/pre&gt;<br /> }}&lt;/noinclude&gt;</div>

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