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<TITLE>sane-devel: Re: 8-bit vs 12-bit</TITLE>
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<META NAME="Author" CONTENT="Oliver Rauch (oliver.rauch@Wolfsburg.DE)">
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<META NAME="Subject" CONTENT="Re: 8-bit vs 12-bit">
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<H1>Re: 8-bit vs 12-bit</H1>
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<!-- name="Oliver Rauch" -->
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<!-- subject="Re: 8-bit vs 12-bit" -->
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<STRONG>From:</STRONG> Oliver Rauch (<A HREF="mailto:oliver.rauch@Wolfsburg.DE?Subject=Re:%208-bit%20vs%2012-bit&In-Reply-To=<38821398.6873CACE@wolfsburg.de>"><EM>oliver.rauch@Wolfsburg.DE</EM></A>)<BR>
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<STRONG>Date:</STRONG> Sun Jan 16 2000 - 10:53:12 PST
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<P>
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<LI><STRONG>Next message:</STRONG> <A HREF="0104.html">Oliver Rauch: "Re: Lineart, xsane, and microtek backend"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0102.html">Peter Kirchgessner: "Re: More info on my HP Scanjet IIp prob."</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0095.html">Rick Rosinski: "8-bit vs 12-bit"</A>
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<P>
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Rick Rosinski wrote:
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<BR>
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<P><EM>> What is the difference between 8-bit and 12-bit images?
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</EM><BR>
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<EM>> I notice that it takes twice as much space for a pnm file under 12-bit vs 8-bit.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> When I used Sane 1.00 under SuSE 6.1, I was able to scan (xscanimage) 12-bit
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</EM><BR>
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<EM>> images and view them in GIMP. But when I tried Sane 1.0.1 with Umax 1.0.1
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</EM><BR>
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<EM>> back-end (Umax Astra 1220s), I was only able to scan in 8-bit mode. 12-bit
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</EM><BR>
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<EM>> yielded purple text and green background. 8-bit looks good.
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> Ultimately, I will be using xscanimage to scan photographs. I have many photos
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</EM><BR>
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<EM>> stored under 12-bit graphics, which were converted to JPGs, but now I cannot
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</EM><BR>
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<EM>> scan in 12-bit. I would rather scan in 12-bit just to make sure that the
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</EM><BR>
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<EM>> photos are the best they can be?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> What is the difference, and is there a way to get Sane 1.0.1 to do 12-bit like
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</EM><BR>
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<EM>> 1.0 did?
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</EM><BR>
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<EM>>
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</EM><BR>
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<EM>> I am using Umax Astra 1220s on a Slackware 7.0 system.
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</EM><BR>
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<EM>>
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</EM><BR>
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<P>Hi Rick,
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<BR>
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<P>1) xscanimage does not support 12 bpp (16bpp) at all, if you got a good looking
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<BR>
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output with it that was luck.
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<BR>
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2) if you do not know for what it is good you simply don`t need it. Displays and
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<BR>
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graphic programs normally work with 8(24) bpp. A printer is not able to
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<BR>
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make visibile all information that are in 8/24) bpp.
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<BR>
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Only if you want to do "hard" color correction AFTER scanning it could get relevant.
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<BR>
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3) Try xsane if you really think you need it.
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<BR>
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<P>Bye
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<BR>
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Oliver
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<BR>
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<P><P><P><PRE>
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--
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Homepage: <A HREF="http://www.wolfsburg.de/~rauch">http://www.wolfsburg.de/~rauch</A>
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sane-umax: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-umax.html">http://www.wolfsburg.de/~rauch/sane/sane-umax.html</A>
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xsane: <A HREF="http://www.wolfsburg.de/~rauch/sane/sane-xsane.html">http://www.wolfsburg.de/~rauch/sane/sane-xsane.html</A>
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E-Mail: mailto:<A HREF="mailto:Oliver.Rauch@Wolfsburg.DE?Subject=Re:%208-bit%20vs%2012-bit&In-Reply-To=<38821398.6873CACE@wolfsburg.de>">Oliver.Rauch@Wolfsburg.DE</A>
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<P><P><P><P>--
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Source code, list archive, and docs: <A HREF="http://www.mostang.com/sane/">http://www.mostang.com/sane/</A>
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To unsubscribe: echo unsubscribe sane-devel | mail <A HREF="mailto:majordomo@mostang.com?Subject=Re:%208-bit%20vs%2012-bit&In-Reply-To=<38821398.6873CACE@wolfsburg.de>">majordomo@mostang.com</A>
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</PRE>
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<LI><STRONG>Next message:</STRONG> <A HREF="0104.html">Oliver Rauch: "Re: Lineart, xsane, and microtek backend"</A>
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<LI><STRONG>Previous message:</STRONG> <A HREF="0102.html">Peter Kirchgessner: "Re: More info on my HP Scanjet IIp prob."</A>
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<LI><STRONG>In reply to:</STRONG> <A HREF="0095.html">Rick Rosinski: "8-bit vs 12-bit"</A>
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This archive was generated by <A HREF="http://www.hypermail.org/">hypermail 2b29</A>
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: <EM>Sun Jan 16 2000 - 10:53:18 PST</EM>
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