The computer color spectrum with comparative strengths of the colors.
<a href="//commons.wikimedia.org/wiki/User:DarkEvil" title="User:DarkEvil">DarkEvil</a>
<a href="//commons.wikimedia.org/wiki/User:DarkEvil" title="User:DarkEvil">DarkEvil</a>, based on <a href="https://en.wikipedia.org/wiki/Image:Computerspectrum.png" class="extiw" title="en:Image:Computerspectrum.png">en:Image:Computerspectrum.png</a> which is free.