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<TITLE>sane-devel: Re: Getting compressed B/W image data from Fujitsu</TITLE>
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<H1>Re: Getting compressed B/W image data from Fujitsu M3096GXm scanner</H1>
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<STRONG>From:</STRONG> Tom Martone (<A HREF="mailto:tom@martoneconsulting.com?Subject=Re:%20Getting%20compressed%20B/W%20image%20data%20from%20Fujitsu%20M3096GXm%20scanner&In-Reply-To=&lt;3A7B5E3E.D3C68B23@martoneconsulting.com&gt;"><EM>tom@martoneconsulting.com</EM></A>)<BR>
<STRONG>Date:</STRONG> Fri Feb 02 2001 - 17:26:22 PST
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Greetings,
<BR>
<P>Armistead, Jason wrote:
<BR>
<EM>&gt;
</EM><BR>
<EM>&gt; I would have thought that some of the top-end high volume
</EM><BR>
<EM>&gt; scanners like Bell &amp; Howell would surely support on-board compression, and
</EM><BR>
<EM>&gt; that someone, somewhere might have added them to SANE.
</EM><BR>
<P>The Bell &amp; Howell Copiscan II series does support several compressed
<BR>
formats (CCITT G3, CCITT G3-2D, CCITT G4) and the SANE driver sane-bh
<BR>
supports these. To fully utilize the compressed formats, a patch to
<BR>
sane.h is necessary which adds several new frametypes.
<BR>
<P>&nbsp;&nbsp;&nbsp;&nbsp;/* optional frames */
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;SANE_FRAME_TEXT = 10, /* Human readable text non-image data */
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;SANE_FRAME_JPEG = 11, /* JPEG compressed image */
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;SANE_FRAME_G31D = 12, /* Group 3 1D compressed image */
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;SANE_FRAME_G32D = 13, /* Group 3 2D compressed image */
<BR>
&nbsp;&nbsp;&nbsp;&nbsp;SANE_FRAME_G42D = 14 /* Group 4 2D compressed image */
<BR>
<P>Compressed formats are not supported in the current SANE standard,
<BR>
and are to be addressed in the next major version of SANE. Unofficially,
<BR>
and non-standardly, I guess, a simple addition of a few enumeration
<BR>
values and a cooperating front and back end is all you would need
<BR>
to get this going on your compression-enabled scanner.
<BR>
<P>Happy scanning,
<BR>
Tom
<BR>
<P><PRE>
--
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