Received: from inav032.isp.belgacom.be (localhost.localdomain [127.0.0.1])
	by inav032.isp.belgacom.be (Postfix) with ESMTP id 774A9AF12E
	for <joris.at.lebbeke@skynet.be>; Fri,  1 Dec 2006 18:33:41 +0100 (CET)
Received: from inas026.isp.belgacom.be (inas026.isp.belgacom.be [195.238.4.250])
	by inav032.isp.belgacom.be (Postfix) with ESMTP id 611EFAF042
	for <joris.at.lebbeke@skynet.be>; Fri,  1 Dec 2006 18:33:41 +0100 (CET)
Received: from inmx016.isp.belgacom.be (inmx016.isp.belgacom.be [195.238.4.219])
        by inas026.isp.belgacom.be (8.12.11.20060308/8.12.11/Skynet-IN-AS-2.03) with ESMTP id kB1GdJJ8006948
        for <joris.at.lebbeke@skynet.be>; Fri, 1 Dec 2006 18:33:36 +0100
        (envelope-from <tiff-bounces@lists.maptools.org>)
Received: from duke.maptools.org (r153.dmsolutions.ca [209.217.116.153] (may be forged))
        by inmx016.isp.belgacom.be (8.12.11.20060308/8.12.11/Skynet-IN-2.32) with ESMTP id kB1ENU0t001596
        for <joris.at.lebbeke@skynet.be>; Fri, 1 Dec 2006 15:23:32 +0100
        (envelope-from <tiff-bounces@lists.maptools.org>)
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 kB1B0T8M011026;
	Fri, 1 Dec 2006 06:01:43 -0500
Received: from hermes.culture.fr (hermes.culture.fr [143.126.201.210])
	by duke.maptools.org (8.12.11/8.12.10) with ESMTP id kB1B0Q95011023
	for <tiff@lists.maptools.org>; Fri, 1 Dec 2006 06:00:27 -0500
Received: by mta.culture.fr with id kB1B0OUr016638
	for <tiff@lists.maptools.org>; Fri, 1 Dec 2006 12:00:25 +0100
Received: from archives.culture.fr (archives.culture.fr) by pasteur.culture.fr
	(Content Technologies SMTPRS 4.3.17) with ESMTP id
	<T7c4a4bc4ba8f7ec9dc7d0@pasteur.culture.fr>; 
	Fri, 1 Dec 2006 12:00:24 +0100
Received: by archives.culture.fr with ESMTP id kB1B0A3g031513;
	Fri, 1 Dec 2006 12:00:15 +0100
Message-ID: <45700B5E.90102@culture.gouv.fr>
Date: Fri, 01 Dec 2006 12:00:46 +0100
From: LERIDANT Jean-Yves <jean-yves.leridant@culture.gouv.fr>
User-Agent: Mozilla Thunderbird 0.7.3 (Windows/20040803)
X-Accept-Language: fr, en
MIME-Version: 1.0
To: Lee Howard <faxguy@howardsilvan.com>
Subject: Re: [Tiff] ITULAB JPEG support
References: <456F037A.6030207@howardsilvan.com>
In-Reply-To: <456F037A.6030207@howardsilvan.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Content-Transfer-Encoding: 7bit
Cc: blas@fractalia.com, john.barber@emccsoft.com, tiff@lists.maptools.org
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>
Sender: tiff-bounces@lists.maptools.org
Errors-To: tiff-bounces@lists.maptools.org
X-UIDL: 000000000023ceae.00001dd7
X-MSP-STORE: Fri, 01 Dec 2006 18:33:41 +0100
Status:   


> In any case can we not allow dependence on the JPEGCOLORMODE rat's 
> nest of
> hacks to grow, and that's exactly what we would be doing if we allow the
> support for ITULAB to be tied in with LibJpeg.
>
More and by hell, I don't understand what color process different of 
YCbCr  ( in turn nothing ) ,
a LibJpeg might apply  to  ICCLAB or ITULAB ...
However, I perfectly agree with something like trashing-out whatever 
color space conversions
below tif_jpeg entry point, ( note that now, anyone can process color 
conversion as he want,
and then feed codec with it as YCbCr ) but :
elimination of the horrible JPEGCOLORMODE  pseudo-tag ( and real 
abomination )
will not solve ***the*** problem : the demented xxx-subsampling tag,  
that a not too much
brain-damaged libtiff would understand for jpeg files, as a parameter in 
the in the same sense
that quality factor on the compression side, and override to (1,1) on 
the decompression side
(in some way as strip_chopping ).

--
Jean-Yves Le Ridant


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