sane-project-website/old-archive/1999-08/0013.html

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<title>sane-devel: Re: xsane-0.31 available</title>
<h1>Re: xsane-0.31 available</h1>
<b>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
<i>Mon, 02 Aug 1999 19:08:36 +0200</i>
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"Ewald R. de Wit" wrote:<br>
<p>
<i>&gt; Oliver Rauch (<a href="mailto:oliver.rauch@Wolfsburg.DE">oliver.rauch@Wolfsburg.DE</a>) wrote:</i><br>
<i>&gt; &gt; that is the reason why I renamed it!</i><br>
<i>&gt; &gt; The frontend does not need to know how the alpha channel</i><br>
<i>&gt; &gt; is generated, so it is better to name it alpha than infrared.</i><br>
<i>&gt;</i><br>
<i>&gt; I feel it's a bit stupid and confusing to call it the alpha channel.</i><br>
<i>&gt; Alpha channel has a very well defined and established meaning in the</i><br>
<i>&gt; graphics world. Just because you can dump the infrared data into the</i><br>
<i>&gt; 4th channel of a file doesn't make this data 'alpha' in any way. If</i><br>
<i>&gt; you look at the SANE standard, it defines the red channel as 'data</i><br>
<i>&gt; from the red spectral band', etc. , so why would the infrared channel</i><br>
<i>&gt; be treated differently.</i><br>
<i>&gt;</i><br>
<i>&gt; Should scanners in the future support a different sort of 4th channel,</i><br>
<i>&gt; lets say height, then it should get it's own SANE_FRAME name (eg RGBH</i><br>
<i>&gt; or something).</i><br>
<i>&gt;</i><br>
<i>&gt; The SANE_FRAME name tells the frontend what sort of data it is that it</i><br>
<i>&gt; receives. Perhaps your frontend isn't interested in this but other</i><br>
<i>&gt; frontends might.</i><br>
<i>&gt;</i><br>
<i>&gt;</i><br>
<p>
Hi Ewald,<br>
<p>
the idea of the infrared-channel of the slide scanners is comparable<br>
to the alpha channel. It is to detect dust and things like that to<br>
identify the transparency of the slide.<br>
<p>
Of course we could add an IR and an UV channel and thousands of other<br>
channels, but then somone should go and define image file formats that do<br>
suppurt such data.<br>
<p>
Bye<br>
Oliver<br>
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EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
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