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+  <title>An explanation of common terminal emulator color codes — Luke T. Shumaker</title>
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+<header><a href="/">Luke T. Shumaker</a> » <a href=/blog>blog</a> » term-colors</header>
+<article>
+<h1 id="an-explanation-of-common-terminal-emulator-color-codes">An
+explanation of common terminal emulator color codes</h1>
+<p>This is based on a post on <a
+href="http://www.reddit.com/r/commandline/comments/1aotaj/solarized_is_a_sixteen_color_palette_designed_for/c8ztxpt?context=1">reddit</a>,
+published on 2013-03-21.</p>
+<blockquote>
+<p>So all terminals support the same 256 colors? What about 88 color
+mode: is that a subset?</p>
+</blockquote>
+<p>TL;DR: yes</p>
+<p>Terminal compatibility is crazy complex, because nobody actually
+reads the spec, they just write something that is compatible for their
+tests. Then things have to be compatible with that terminal’s
+quirks.</p>
+<p>But, here’s how 8-color, 16-color, and 256 color work. IIRC, 88 color
+is a subset of the 256 color scheme, but I’m not sure.</p>
+<p><strong>8 colors: (actually 9)</strong> First we had 8 colors (9 with
+“default”, which doesn’t have to be one of the 8). These are always
+roughly the same color: black, red, green, yellow/orange, blue, purple,
+cyan, and white, which are colors 0–7 respectively. Color 9 is
+default.</p>
+<p><strong>16 colors: (actually 18)</strong> Later, someone wanted to
+add more colors, so they added a “bright” attribute. So when bright is
+on, you get “bright red” instead of “red”. Hence 8*2=16 (plus two more
+for “default” and “bright default”).</p>
+<p><strong>256 colors: (actually 274)</strong> You may have noticed,
+colors 0–7 and 9 are used, but 8 isn’t. So, someone decided that color 8
+should put the terminal into 256 color mode. In this mode, it reads
+another byte, which is an 8-bit RGB value (2 bits for red, 2 for green,
+2 for blue). The bright property has no effect on these colors. However,
+a terminal can display 256-color-mode colors and 16-color-mode colors at
+the same time, so you actually get 256+18 colors.</p>
+
+</article>
+<footer>
+  <aside class="sponsor"><p>I'd love it if you <a class="em"
+      href="/sponsor/">sponsored me</a>.  It will allow me to continue
+      <a class="em" href="/imworkingon/">my work</a> on the GNU/Linux
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+
+<p>The content of this page is Copyright © 2013 <a href="mailto:lukeshu@lukeshu.com">Luke T. Shumaker</a>.</p>
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