Return-Path: <tiff-bounces@lists.maptools.org>
Received: from mailgate109.isp.belgacom.be (mailgate109.isp.belgacom.be [195.238.6.92])
        by inmx005.isp.belgacom.be (8.12.11.20060308/8.12.11/Skynet-IN-2.32) with ESMTP id l4DI0if7002538
        for <joris.at.lebbeke@skynet.be>; Sun, 13 May 2007 20:00:45 +0200
        (envelope-from <tiff-bounces@lists.maptools.org>)
Received: from r153.dmsolutions.ca (HELO duke.maptools.org) ([209.217.116.153])
  by in.mx.skynet.be with ESMTP; 13 May 2007 20:00:45 +0200
Received: from duke.maptools.org (duke.maptools.org [127.0.0.1])
	by duke.maptools.org (8.12.11/8.12.10) with ESMTP id l4DHlort021675;
	Sun, 13 May 2007 13:49:17 -0400
Received: from web59313.mail.re1.yahoo.com (web59313.mail.re1.yahoo.com
	[66.196.101.54])
	by duke.maptools.org (8.12.11/8.12.10) with SMTP id l4DHllge021672
	for <tiff@lists.maptools.org>; Sun, 13 May 2007 13:47:47 -0400
Received: (qmail 91890 invoked by uid 60001); 13 May 2007 17:47:29 -0000
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=s1024; d=yahoo.com;
	h=X-YMail-OSG:Received:Date:From:Subject:To:MIME-Version:Content-Type:Content-Transfer-Encoding:Message-ID;
	b=K+fynqdERJASMYiL2HtmZ0GENqCLitwrFHGnani04D5wGlXqIDQPWupG+InNWgu3laRlSkQUsMzV82+4Pk5RAemonBnzZWrW0B/kVIg2I+JPBtUnnTbkWnWzDznjyw7idUO71JtriAyzEkBcCQEumcZjb6652Q5nxvBjz0shGXI=;
X-YMail-OSG: 71W24W8VM1ndTgg_vSDnfrHahaKfj2cXU3kulsz09Xz4VfDGXbEcsjKPblL8eW9xpK63ZJIjRtRw3Sd7gwVulBWpk.1wiZwK4jHfGoWIsn_4VGMfbxWj1cFQrbEAUW3K
Received: from [70.126.86.64] by web59313.mail.re1.yahoo.com via HTTP;
	Sun, 13 May 2007 10:47:29 PDT
Date: Sun, 13 May 2007 10:47:29 -0700 (PDT)
From: t t <questionwood@yahoo.com>
To: tiff@lists.maptools.org
MIME-Version: 1.0
Message-ID: <952606.91883.qm@web59313.mail.re1.yahoo.com>
Subject: [Tiff] JBIG2 compressed TIF question about bpp
X-BeenThere: tiff@lists.maptools.org
X-Mailman-Version: 2.1.4
Precedence: list
List-Id: TIFF and libtiff discussion <tiff.lists.maptools.org>
List-Unsubscribe: <http://lists.maptools.org/mailman/listinfo/tiff>,
	<mailto:tiff-request@lists.maptools.org?subject=unsubscribe>
List-Archive: <http://lists.maptools.org/mailman/private/tiff>
List-Post: <mailto:tiff@lists.maptools.org>
List-Help: <mailto:tiff-request@lists.maptools.org?subject=help>
List-Subscribe: <http://lists.maptools.org/mailman/listinfo/tiff>,
	<mailto:tiff-request@lists.maptools.org?subject=subscribe>
Content-Type: multipart/mixed; boundary="===============1601087886=="
Sender: tiff-bounces@lists.maptools.org
Errors-To: tiff-bounces@lists.maptools.org
X-UIDL: 000000000023ceae.0000237f
X-MSP-STORE: Sun, 13 May 2007 20:00:58 +0200
Status: RO

--===============1601087886==
Content-Type: multipart/alternative; boundary="0-301415063-1179078449=:91883"
Content-Transfer-Encoding: 8bit

--0-301415063-1179078449=:91883
Content-Type: text/plain; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

Hi everybody,

I've used this site many times before to look up TIFF tags and look at the TIFF specification.  My question is about a JBIG2-compressed TIF.  Now I know JBIG2 is a bitonal compression standard, but if you save let's say a 24-bit TIF with JBIG2 compression should it work according to the specification or do you have to start with a 1-bit TIF first?

I'm using some imaging software and I can successfully start with a 24-bit TIF and save it as a PDF with JBIG2 compression so it's 1 bit.  But if I start with a 24-bit TIF and save it as a TIF with JBIG2 compression an exception is thrown, but if start with a 1-bit TIF and save it as a TIF with JBIG2 compression it works fine as it should.  I know if you start with a non 1-bit TIF and save it with G4 compression it will take it to 1-bit without a problem.

I found a very similar question in the archives here where somebody wanted to save a non 1-bit TIF with RLE encoding but the TIF specification doesn't support that and he would have to take it down to 1-bit first to do it.

So is this a problem with the software I'm using or does the TIF specification not support it?

Thanks,

       
---------------------------------
Be a better Globetrotter. Get better travel answers from someone who knows.
Yahoo! Answers - Check it out.
--0-301415063-1179078449=:91883
Content-Type: text/html; charset=iso-8859-1
Content-Transfer-Encoding: 8bit

Hi everybody,<br><br>I've used this site many times before to look up TIFF tags and look at the TIFF specification.&nbsp; My question is about a JBIG2-compressed TIF.&nbsp; Now I know JBIG2 is a bitonal compression standard, but if you save let's say a 24-bit TIF with JBIG2 compression should it work according to the specification or do you have to start with a 1-bit TIF first?<br><br>I'm using some imaging software and I can successfully start with a 24-bit TIF and save it as a PDF with JBIG2 compression so it's 1 bit.&nbsp; But if I start with a 24-bit TIF and save it as a TIF with JBIG2 compression an exception is thrown, but if start with a 1-bit TIF and save it as a TIF with JBIG2 compression it works fine as it should.&nbsp; I know if you start with a non 1-bit TIF and save it with G4 compression it will take it to 1-bit without a problem.<br><br>I found a very similar question in the archives here where somebody wanted to save a non 1-bit TIF with RLE encoding but
 the TIF specification doesn't support that and he would have to take it down to 1-bit first to do it.<br><br>So is this a problem with the software I'm using or does the TIF specification not support it?<br><br>Thanks,<br><p>&#32;
      <hr size=1>Be a better Globetrotter. <a href="http://us.rd.yahoo.com/evt=48254/*http://answers.yahoo.com/dir/_ylc=X3oDMTI5MGx2aThyBF9TAzIxMTU1MDAzNTIEX3MDMzk2NTQ1MTAzBHNlYwNCQUJwaWxsYXJfTklfMzYwBHNsawNQcm9kdWN0X3F1ZXN0aW9uX3BhZ2U-?link=list&sid=396545469">Get better travel answers </a>from someone who knows.<br>Yahoo! Answers - Check it out.


--0-301415063-1179078449=:91883--

--===============1601087886==
Content-Type: text/plain; charset="us-ascii"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Content-Disposition: inline

_______________________________________________
Tiff mailing list: Tiff@lists.maptools.org
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/
--===============1601087886==--
