sane-project-website/old-archive/1999-04/0399.html

<!-- received="Wed Apr 28 03:50:23 1999 PDT" -->
<!-- sent="Wed, 28 Apr 1999 12:08:30 +0200" -->
<!-- name="abel deuring" -->
<!-- email="a.deuring@satzbau-gmbh.de" -->
<!-- subject="Re: HP PhotoSmart R030 vs. SANE 1.01" -->
<!-- id="" -->
<!-- inreplyto="HP PhotoSmart R030 vs. SANE 1.01" -->
<title>sane-devel: Re: HP PhotoSmart R030 vs. SANE 1.01</title>
<h1>Re: HP PhotoSmart R030 vs. SANE 1.01</h1>
<b>abel deuring</b> (<a href="mailto:a.deuring@satzbau-gmbh.de"><i>a.deuring@satzbau-gmbh.de</i></a>)<br>
<i>Wed, 28 Apr 1999 12:08:30 +0200</i>
<p>
<ul>
<li> <b>Messages sorted by:</b> <a href="date.html#399">[ date ]</a><a href="index.html#399">[ thread ]</a><a href="subject.html#399">[ subject ]</a><a href="author.html#399">[ author ]</a>
<!-- next="start" -->
<li> <b>Next message:</b> <a href="0400.html">Ingo Wilken: "Re: May sane_init fail?"</a>
<li> <b>Previous message:</b> <a href="0398.html">Graham Stoney: "Possible fix for Sane 1.0.1 segfault in RedHat 5.1 (net)"</a>
<li> <b>Maybe in reply to:</b> <a href="0366.html">Russ Price: "HP PhotoSmart R030 vs. SANE 1.01"</a>
<!-- nextthread="start" -->
<!-- reply="end" -->
</ul>
<!-- body="start" -->
Russ Price wrote:<br>
<i>&gt; </i><br>
<i>&gt; I have one of these, and I've discovered that Kodachrome slides don't</i><br>
<i>&gt; look too good when scanned. Even at 300% exposure with high levels of</i><br>
<i>&gt; gamma correction, they still come out with a purplish tint. Are there</i><br>
<i>&gt; any things I can reasonably do to improve this? The slides come out fine</i><br>
<i>&gt; when using the windoze scanning software.</i><br>
<p>
This points to a general problem of Sane: At the time, Sane has<br>
no mechanisms for color correction. This is especially a problem<br>
for slide scanners, because the color representation of negatives<br>
is very different from the one of slides. But color correction<br>
can also be useful for flatbed scanners.<br>
<p>
The most easy solution for this is of course, to declare color<br>
correction to be an issue for image processing programs like Gimp,<br>
but, on the other hand, scanimage for example is very useful for <br>
batch scans - and having batch scans color corrected, would be <br>
fine. And the ICC standard for example has the concept of an<br>
"abstract" representation of color data: It is up to the programs<br>
for data aquisition to convert the data from the device color space<br>
into the "abstract" color space, and it's the task of display / <br>
output programs to convert the color represention into the output <br>
device's color space.<br>
<p>
Unfortunately, I don't have enough time to think much about how to<br>
integrate color correction and / or calibration into Sane (not to<br>
speak of implementing it...), but perhaps somebody else is<br>
interested in this topic.<br>
<p>
The ICC standard (<a href="http://www.color.org/index.html">http://www.color.org/index.html</a>) is quite <br>
powerful -- and it is, as far as I know, an open standard. So,<br>
what about integrating ICC into Sane?<br>
<p>
Abel<br>
<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="0400.html">Ingo Wilken: "Re: May sane_init fail?"</a>
<li> <b>Previous message:</b> <a href="0398.html">Graham Stoney: "Possible fix for Sane 1.0.1 segfault in RedHat 5.1 (net)"</a>
<li> <b>Maybe in reply to:</b> <a href="0366.html">Russ Price: "HP PhotoSmart R030 vs. SANE 1.01"</a>
<!-- nextthread="start" -->
<!-- reply="end" -->
</ul>