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Date: Sun, 22 Jan 2006 18:47:53 -0800
Subject: Re: [Tiff] LibTIff and Photoshop TIFF support (Multipage TIffs)
From: Chris Cox <ccox@adobe.com>
To: <tiff@lists.maptools.org>
Message-ID: <BFF983D9.1E55%ccox@adobe.com>
Thread-Topic: [Tiff] LibTIff and Photoshop TIFF support (Multipage TIffs)
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The Photoshop layer data is documented in the Photoshop PSD file format SDK.

Chris



On 1/22/06 3:55 PM, "Jeet Shroff" <jkshroff@gmail.com> wrote:

>  
> hello there,
>  
> i was currently working on using LibTIffs to import and export tiff files and
> am interested in getting this working with TIFFS that are generated using
> Photoshop. 
> Basically i am interested in gaining access to the layered data that you can
> store in Photoshop TIFFS. This layered data is stored in Tag number 37724
> (ImageSourceData tag) and is not recognized by LibTiff. Through the posts in
> the mailing list I have seen that LibTiff just throws a warning when it
> reaches this tag and does not know what to do. Has anyone got this working, as
> in successfully able to read in the layered data that is stored in the TIFFs
> from Photoshop using LibTiff?
> 
> If there is no easy access using the LibTiff interface, is there a way to gain
> access to that tag and have it read in and then I can manipulate and traverse
> to that data in the file myself and deal with it accordingly then. But how do
> I gain access to that tag, since LibTiff keeps on saying it's undefined or
> private. I can extend it, but the actual Tag is not clearly defined, as in it
> could be any size, and i'm not sure how I can use LibTiff to get this data or
> even the beginning of where this layered data could be located.
> 
> Also -- where can I generate or gain access to multi-page tiffs? I don't know
> any program that can generate Tiffs like that for me. I've tried Photoshop and
> GIMP. Does anyone have regular non-layered multi-page TIFFs that have 2 or
> more images stored in them and so we can use the SetDirectory and
> ReadDirectory functions in LibTiff to gain access to the different image data
> for those images?
> 
> Any help with this will be highly appreciated.
> Thank you.
>  
> 
> 
> _______________________________________________
> Tiff mailing list: Tiff@lists.maptools.org
> http://lists.maptools.org/mailman/listinfo/tiff
> http://www.remotesensing.org/libtiff/



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<HTML>
<HEAD>
<TITLE>Re: [Tiff] LibTIff and Photoshop TIFF support (Multipage TIffs)</TIT=
LE>
</HEAD>
<BODY>
<FONT FACE=3D"Verdana, Helvetica, Arial"><SPAN STYLE=3D'font-size:12.0px'>The P=
hotoshop layer data is documented in the Photoshop PSD file format SDK.<BR>
<BR>
Chris<BR>
<BR>
<BR>
<BR>
On 1/22/06 3:55 PM, &quot;Jeet Shroff&quot; &lt;jkshroff@gmail.com&gt; wrot=
e:<BR>
<BR>
</SPAN></FONT><BLOCKQUOTE><FONT FACE=3D"Verdana, Helvetica, Arial"><SPAN STYL=
E=3D'font-size:12.0px'> <BR>
hello there,<BR>
&nbsp;<BR>
i was currently working on using LibTIffs to import and export tiff files a=
nd am interested in getting this working with TIFFS that are generated using=
 Photoshop. <BR>
Basically i am interested in gaining access to the layered data that you ca=
n store in Photoshop TIFFS. This layered data is stored in Tag number 37724 =
(ImageSourceData tag) and is not recognized by LibTiff. Through the posts in=
 the mailing list I have seen that LibTiff just throws a warning when it rea=
ches this tag and does not know what to do. Has anyone got this working, as =
in successfully able to read in the layered data that is stored in the TIFFs=
 from Photoshop using LibTiff? <BR>
<BR>
If there is no easy access using the LibTiff interface, is there a way to g=
ain access to that tag and have it read in and then I can manipulate and tra=
verse to that data in the file myself and deal with it accordingly then. But=
 how do I gain access to that tag, since LibTiff keeps on saying it's undefi=
ned or private. I can extend it, but the actual Tag is not clearly defined, =
as in it could be any size, and i'm not sure how I can use LibTiff to get th=
is data or even the beginning of where this layered data could be located. <=
BR>
<BR>
Also -- where can I generate or gain access to multi-page tiffs? I don't kn=
ow any program that can generate Tiffs like that for me. I've tried Photosho=
p and GIMP. Does anyone have regular non-layered multi-page TIFFs that have =
2 or more images stored in them and so we can use the SetDirectory and ReadD=
irectory functions in LibTiff to gain access to the different image data for=
 those images? <BR>
<BR>
Any help with this will be highly appreciated. <BR>
Thank you.<BR>
&nbsp;<BR>
<BR>
<HR ALIGN=3DCENTER SIZE=3D"3" WIDTH=3D"95%"></SPAN></FONT><FONT SIZE=3D"1"><FONT FA=
CE=3D"Monaco, Courier New"><SPAN STYLE=3D'font-size:9.0px'>_____________________=
__________________________<BR>
Tiff mailing list: Tiff@lists.maptools.org<BR>
<a href=3D"http://lists.maptools.org/mailman/listinfo/tiff">http://lists.mapt=
ools.org/mailman/listinfo/tiff</a><BR>
<a href=3D"http://www.remotesensing.org/libtiff/">http://www.remotesensing.or=
g/libtiff/</a><BR>
</SPAN></FONT></FONT></BLOCKQUOTE><FONT SIZE=3D"1"><FONT FACE=3D"Monaco, Courie=
r New"><SPAN STYLE=3D'font-size:9.0px'><BR>
</SPAN></FONT></FONT>
</BODY>
</HTML>


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_______________________________________________
Tiff mailing list: Tiff@lists.maptools.org
http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/
--===============0798068709==--

