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Retidy, removing align=left from headings and empty paragraphs

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James Gregory 2013-12-30 15:37:13 +11:00
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
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<center>
<table border="1">
<tr>
<td><a href="54-05.html">Previous</a></td>
<td>
<a href="54-05.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="55-02.html">Next</a></td>
<td>
<a href="55-02.html">Next</a>
</td>
</tr>
</table>
</center>
<p><br /></p>
<h2 id="Heading1">Chapter 55<br />
Color Modeling in 256-Color Mode</h2>
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<p>What does this anecdote tell us about the universe in which we live? Well, it certainly indicates that this universe is inhabited by at least one comedian and one good straight man. Beyond that, though, it can be construed as a parable about the difficulty of defining things properly; for example, consider the complications inherent in the definition of color on a 256-color display adapter such as the VGA. Coincidentally, VGA color modeling just happens to be this chapter&rsquo;s topic, and the place to start is with color modeling in general.</p>
<h4 align="left" id="Heading3">A Color Model</h4>
<h4 id="Heading3">A Color Model</h4>
<p>We&rsquo;ve been developing X-Sharp for several chapters now. In the previous chapter, we added illumination sources and shading; that addition makes it necessary for us to have a general-purpose color model, so that we can display the gradations of color intensity necessary to render illuminated surfaces properly. In other words, when a bright light is shining straight at a green surface, we need to be able to display bright green, and as that light dims or tilts to strike the surface at a shallower angle, we need to be able to display progressively dimmer shades of green.</p>
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<p>When the JPL team went to test the eye&rsquo;s sensitivity to color on the screen, they found that only about 16,000,000 colors could be distinguished, because the color-sensing mechanism of the human eye is more compatible with reflective sources such as paper and ink than with emissive sources such as CRTs. Still, the human eye can distinguish about 16,000,000 colors on the screen. That&rsquo;s not so hard to believe, if you think about it; the eye senses each primary color separately, so we&rsquo;re really only talking about detecting 256 levels of intensity per primary here. It&rsquo;s the brain that does the amazing part; the 16,000,000-plus color capability actually comes not from extraordinary sensitivity in the eye, but rather from the brain&rsquo;s ability to distinguish between all the mixes of 256 levels of each of three primaries.</p>
<p><br /></p>
<center>
<table border="1">
<tr>
<td><a href="54-05.html">Previous</a></td>
<td>
<a href="54-05.html">Previous</a>
</td>
<td><a href="index.html">Table of Contents</a></td>
<td>
<a href="index.html">Table of Contents</a>
</td>
<td><a href="55-02.html">Next</a></td>
<td>
<a href="55-02.html">Next</a>
</td>
</tr>
</table>
</center>