Return-Path: <tiff-bounces@lists.maptools.org>
Received: from inas027.isp.belgacom.be (localhost [127.0.0.1])
        by inav008.isp.belgacom.be (8.12.11/8.12.11/Skynet-IN-AV-3.00) with ESMTP id jB5NDrK9004936
        for <joris.at.lebbeke@skynet.be>; Tue, 6 Dec 2005 00:13:53 +0100
        (envelope-from <tiff-bounces@lists.maptools.org>)
Received: from inmx006.isp.belgacom.be (inmx006.isp.belgacom.be [195.238.4.106])
        by inas027.isp.belgacom.be (8.12.11/8.12.11/Skynet-IN-AS-2.03) with ESMTP id jB5NDol9027851
        for <joris.at.lebbeke@skynet.be>; Tue, 6 Dec 2005 00:13:50 +0100
        (envelope-from <tiff-bounces@lists.maptools.org>)
Received: from duke.maptools.org (r153.dmsolutions.ca [209.217.116.153] (may be forged))
        by inmx006.isp.belgacom.be (8.12.11/8.12.11/Skynet-IN-2.32) with ESMTP id jB5NDfHc007561
        for <joris.at.lebbeke@skynet.be>; Tue, 6 Dec 2005 00:13:42 +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 jB5N7APj007924;
	Mon, 5 Dec 2005 18:07:32 -0500
Received: from xproxy.gmail.com (xproxy.gmail.com [66.249.82.205])
	by duke.maptools.org (8.12.11/8.12.10) with ESMTP id jB5N77dI007921
	for <tiff@lists.maptools.org>; Mon, 5 Dec 2005 18:07:07 -0500
Received: by xproxy.gmail.com with SMTP id h28so1871024wxd
	for <tiff@lists.maptools.org>; Mon, 05 Dec 2005 15:07:06 -0800 (PST)
DomainKey-Signature: a=rsa-sha1; q=dns; c=nofws; s=beta; d=gmail.com;
	h=received:message-id:date:from:to:subject:in-reply-to:mime-version:content-type:content-transfer-encoding:content-disposition:references;
	b=tLyJSiwOOGtBocf5vtIeHZXHgyXhFiDQp8q1mxFrgOxizm0jDEuZAmf0H7a78OwsNcr6NNBcwyktrj8quGhSaXenFXEXFAzVyRy23KFHxG1+iGtcpuaZywFTpeP9whuYV4qhs6XlO8+WA0ozc3Ulj1HNRWTM1gdKoe8+Xt3wnyY=
Received: by 10.70.50.10 with SMTP id x10mr7402170wxx;
	Mon, 05 Dec 2005 15:07:05 -0800 (PST)
Received: by 10.70.83.13 with HTTP; Mon, 5 Dec 2005 15:07:05 -0800 (PST)
Message-ID: <464fbb2d0512051507h5d95b29bxfe666d6d018180ec@mail.gmail.com>
Date: Mon, 5 Dec 2005 15:07:05 -0800
From: John Engelke <john.engelke@gmail.com>
To: tiff@lists.maptools.org
Subject: Re: [Tiff] how to split layers in tiff file
In-Reply-To: <20051205223028.7214.qmail@web54108.mail.yahoo.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=ISO-8859-1
Content-Disposition: inline
References: <Pine.SOC.4.60.0512051524050.4804@blade.simplesystems.org>
	<20051205223028.7214.qmail@web54108.mail.yahoo.com>
Content-Transfer-Encoding: 8bit
X-MIME-Autoconverted: from quoted-printable to 8bit by duke.maptools.org id
	jB5N77dI007921
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.00000f14
X-MSP-STORE: Tue, 06 Dec 2005 00:14:00 --22-99
Status:   

There is information about a Photoshop-specific Image Source Data tag
in the March 22, 2002, posting of Adobe Photoshop TIFF Technical
Notes. ( http://partners.adobe.com/public/developer/en/tiff/TIFFphotoshop.pdf
) It states that the tag "37724" contains "the layer and mask
information found in a typical layered Photoshop file". So that is
where the information on photoshop layers, not channels, is contained.

Does anyone know of a TIFF processing library, command-line tool, API
or anything else that can deal with this Adobe tag. I know that
Photoshop and GIMP deal with it, and I am just hoping for something
server side, libtiff or otherwise. I am sorry I would develop this
myself but there is just no time, that is why I am seeking a mature
library that can handle these things. Please help ...

P.S. The handling of Photoshop layers would be a great addition to
libtiff ... (that is if I'm not mistaken by now that it can't handle
this ...)


On 12/5/05, Brad Brock <brad_brock@yahoo.com> wrote:
> In my last post, I mean layers in the context of Photoshop and GIMP. I
> really need a help in this topic. In fact, not only tiff file but also psd
> file, I think both of them are very similar. Please, any help would be
> great. Thank you.
>
>
> Bob Friesenhahn <bfriesen@simple.dallas.tx.us> wrote:
> On Mon, 5 Dec 2005, John Engelke wrote:
>
> > Please any further information on this topic would be helpful. I have
> > a Photoshop Tiff file with embedded layers that I need to either break
> > out and recombine or simply delete, similar to the poster's issue. My
> > issue is about layers as opposed to channels. I would think that since
> > Photoshop is used in like 90+ percent of publishing operations around
> > the world (defacto standard) that this issue would have been
> > addressed. Any guidance whatsoever is appreciated.
>
> As Joris says, TIFF has "channels" rather than "layers". However,
> extra channels can be used to implement "layers". For example, an
> associated alpha channel is called a "layer" by Photoshop.
>
> Bob
> ======================================
> Bob Friesenhahn
> bfriesen@simple.dallas.tx.us,
> http://www.simplesystems.org/users/bfriesen/
> GraphicsMagick Maintainer, http://www.GraphicsMagick.org/

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