sane-project-website/old-archive/1999-05/0106.html

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<title>sane-devel: Re: [Announce] WinSANE 0.1.0.0 Release</title>
<h1>Re: [Announce] WinSANE 0.1.0.0 Release</h1>
<b>Milon Firikis</b> (<a href="mailto:milonf@ariadne-t.gr"><i>milonf@ariadne-t.gr</i></a>)<br>
<i>Wed, 12 May 1999 13:02:32 +0300</i>
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Matthias Fleischer wrote:<br>
<i>&gt; Maybe I'm just nitpicking or simply don't get it -</i><br>
<i>&gt; but shouldn't this actually read:</i><br>
<i>&gt; </i><br>
<p>
No you don't. I actually this question had occured to me also...<br>
<p>
<i>&gt; ...a 4 bit sample could be scaled by a factor of _seventeen_...</i><br>
<i>&gt; </i><br>
<i>&gt; or maybe</i><br>
<i>&gt; </i><br>
<i>&gt; e.g., a 4 bit sample could be shifted left by 4 bit to represent a</i><br>
<i>&gt; sample value of depth 8 or even better multiplied by a factor of</i><br>
<i>&gt; 0x11 (17) so that white pixels still map to white pixels (15*17=255)</i><br>
<i>&gt; </i><br>
<p>
Err?<br>
<p>
white pixel xxxx 0000 &lt;&lt;4 --&gt; 0000 0000 (0)<br>
<p>
White pixels (0) are still white pixels, while black pixels have the<br>
value of (240) since shifting left by 4 is like multiplying by 16. The<br>
only reason to multiply by 17 is to use the whole dynamical range<br>
(0-255) and is not related with the whiteness of pixels AFAIK.<br>
<p>
	MF<br>
<p>
<pre>
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<li> <b>Next message:</b> <a href="0107.html">Pablo Bendersky: "SANE standards"</a>
<li> <b>Previous message:</b> <a href="0105.html">Ewald R. de Wit: "Re: [Announce] WinSANE 0.1.0.0 Release"</a>
<li> <b>Maybe in reply to:</b> <a href="0070.html">Brian Macy: "[Announce] WinSANE 0.1.0.0 Release"</a>
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<li> <b>Next in thread:</b> <a href="0108.html">Matthias Fleischer: "Re: [Announce] WinSANE 0.1.0.0 Release"</a>
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