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<TITLE>sane-devel: Re: Patch for sane.tex (image polarity)</TITLE>
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<H1>Re: Patch for sane.tex (image polarity)</H1>
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<STRONG>From:</STRONG> Nick Lamb (<A HREF="mailto:njl98r@ecs.soton.ac.uk?Subject=Re:%20Patch%20for%20sane.tex%20(image%20polarity)&In-Reply-To=&lt;20001004011704.A1103@ecs.soton.ac.uk&gt;"><EM>njl98r@ecs.soton.ac.uk</EM></A>)<BR>
<STRONG>Date:</STRONG> Tue Oct 03 2000 - 17:17:04 PDT
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On Tue, Oct 03, 2000 at 06:54:55PM +0100, Collins, Martin wrote:
<BR>
<EM>&gt; I may have got the wrong end of the stick here, are you
</EM><BR>
<EM>&gt; (and David) suggesting that 1-bit lineart not be supported?
</EM><BR>
<P>We're all talking about 1bit RGB. Like 1bit of Red, 1bit of Green, 1bit of
<BR>
Blue. So 1 bit per sample, but 3 bits per pixel. Got a use for that?
<BR>
My guess is, when the hardware is capable of it at all, it exists only
<BR>
out of a sense of completeness.
<BR>
<P><EM>&gt; When I try lineart (with calibration switched on so it works)
</EM><BR>
<EM>&gt; with my Mustek A3 Pro I get a grey-scale file. Xsane says
</EM><BR>
<EM>&gt; the file size will be 1MB as I would expect for 1-bit but
</EM><BR>
<EM>&gt; the pnm created is 8MB grey.
</EM><BR>
<P>Looks like an XSane bug, if the A3 Pro actually supports 1bit lineart
<BR>
Did XSane let you choose binary PBM (that's what you want) ?
<BR>
<P><EM>&gt; Now, I plan to scan a lot of black &amp; white stuff , so yes,
</EM><BR>
<EM>&gt; somebody really needs 1-bit color!
</EM><BR>
<P>Nah, you need 1bit Black and white. Color is the stuff with red, and
<BR>
purple and so on. SANE has 1bit B&amp;W (it works upside down which is
<BR>
how this whole thread started... but it works). The question is if we
<BR>
have (working) 1bit RGB, and if so how and to what end?
<BR>
<P>Nick.
<BR>
<P><PRE>
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