kopia lustrzana https://gitlab.com/sane-project/website
82 wiersze
3.0 KiB
HTML
82 wiersze
3.0 KiB
HTML
<!-- received="Mon Apr 5 06:00:17 1999 PDT" -->
|
||
<!-- sent="Mon, 05 Apr 1999 14:01:11 +0200" -->
|
||
<!-- name="Oliver Rauch" -->
|
||
<!-- email="oliver.rauch@Wolfsburg.DE" -->
|
||
<!-- subject="Re: 16 bit per sample support" -->
|
||
<!-- id="" -->
|
||
<!-- inreplyto="16 bit per sample support" -->
|
||
<title>sane-devel: Re: 16 bit per sample support</title>
|
||
<h1>Re: 16 bit per sample support</h1>
|
||
<b>Oliver Rauch</b> (<a href="mailto:oliver.rauch@Wolfsburg.DE"><i>oliver.rauch@Wolfsburg.DE</i></a>)<br>
|
||
<i>Mon, 05 Apr 1999 14:01:11 +0200</i>
|
||
<p>
|
||
<ul>
|
||
<li> <b>Messages sorted by:</b> <a href="date.html#79">[ date ]</a><a href="index.html#79">[ thread ]</a><a href="subject.html#79">[ subject ]</a><a href="author.html#79">[ author ]</a>
|
||
<!-- next="start" -->
|
||
<li> <b>Next message:</b> <a href="0080.html">Oliver Rauch: "Re: Sane drivers"</a>
|
||
<li> <b>Previous message:</b> <a href="0078.html">Milon Firikis: "Re: Sane drivers"</a>
|
||
<!-- nextthread="start" -->
|
||
<!-- reply="end" -->
|
||
</ul>
|
||
<!-- body="start" -->
|
||
Jonathan A. Buzzard wrote:<br>
|
||
<p>
|
||
<i>></i><br>
|
||
<i>></i><br>
|
||
<i>> For example I might have three Xrays of an object, that after some sort</i><br>
|
||
<i>> of registration I wish to stack on top of one another. The Xrays have</i><br>
|
||
<i>> been scanned say at 12 bits, now if you have stretched them though to</i><br>
|
||
<i>> the full dynamic range of 16 bits adding the pixel values together</i><br>
|
||
<i>> will result in loss of information. If they had stayed as 12 bits inside</i><br>
|
||
<i>> a 16 bit value there is no problem.</i><br>
|
||
<i>></i><br>
|
||
<i>> These are dozens of similar cases where stretching the values is simply</i><br>
|
||
<i>> not acceptable. A little check button somewhere which can be unchecked</i><br>
|
||
<i>> for those that don't want stretching would suffice.</i><br>
|
||
<i>></i><br>
|
||
<p>
|
||
Hi Jonathan,<br>
|
||
<p>
|
||
there is no real problem with that.<br>
|
||
<p>
|
||
If the 12 bits are streched to a 16 bit range, the lower 4 bits are simply not<br>
|
||
used.<br>
|
||
If you want to add two images, you have to dived the values by two before you<br>
|
||
add<br>
|
||
the values.<br>
|
||
<p>
|
||
In 8 bit mode it is the same, you get more than 8 bits if you add two 8 bit<br>
|
||
values.<br>
|
||
<p>
|
||
It is not the sense of SANE to deal with such special features.<br>
|
||
SANE is for scanning, we don`t want to make a new pixelgraphic program like gimp<br>
|
||
<p>
|
||
or a program to evaluate any measurements.<br>
|
||
<p>
|
||
Bye<br>
|
||
Oliver<br>
|
||
<p>
|
||
<p>
|
||
<pre>
|
||
--
|
||
EMAIL: <a href="mailto:Oliver.Rauch@Wolfsburg.DE">Oliver.Rauch@Wolfsburg.DE</a>
|
||
WWW: <a href="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</a>
|
||
<p>
|
||
<p>
|
||
<p>
|
||
<p>
|
||
<pre>
|
||
--
|
||
Source code, list archive, and docs: <a href="http://www.mostang.com/sane/">http://www.mostang.com/sane/</a>
|
||
To unsubscribe: echo unsubscribe sane-devel | mail <a href="mailto:majordomo@mostang.com">majordomo@mostang.com</a>
|
||
</pre>
|
||
<!-- body="end" -->
|
||
<p>
|
||
<ul>
|
||
<!-- next="start" -->
|
||
<li> <b>Next message:</b> <a href="0080.html">Oliver Rauch: "Re: Sane drivers"</a>
|
||
<li> <b>Previous message:</b> <a href="0078.html">Milon Firikis: "Re: Sane drivers"</a>
|
||
<!-- nextthread="start" -->
|
||
<!-- reply="end" -->
|
||
</ul>
|