<p>This is mostly an addendum to @Kodiologist's enlightening answer.</p>

<p>I suggest downloading and installing an app that simulates different types of color impairment, and then running your visualizations through it to make sure everyone can enjoy them.  This is obviously especially important if you are using color to communicate information in your picture.</p>

<p>I'm on a mac at home and work, and I use <a href="http://colororacle.org/" rel="nofollow noreferrer">Color Oracle</a> which is simple and non-invasive.  If anyone else has recommendations, especially for other platforms, please leave them in the comments and I'll edit them into the answer.</p>
