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From: "Thomas Oldenkott" <Thomas.Oldenkott@fleischhacker.biz>
To: <tiff@lists.maptools.org>
Date: Tue, 10 Jan 2006 08:41:53 +0100
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Subject: [Tiff] Incorrect IFD???
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Hello,
 
ich have ab problem creating a multipage tiff image. The 8 byte image file
header is ok, but something is going wrong in the IFD. The beginning of the
IFD consists of a 2-byte count of the number of directory (i. e., the number
of fields). My image has 16 tags and the value has to be (in hex) "10 00",
hasn't it? 
I need these images for a special import process. I have a full funcionally
sample (which is not created by me) where the IFD design is correct. But
when I create an multipage tiff image with the lifftib library I get other
values at this postion. Sometimes it is for example FF FF. By checking these
images for the special import process it returns a failure. It can't read
the correct count of the tags (FF FF instead of 10 00).
 
I post some screenshots for a better understanding and in hope that somebody
can help me.
 
example which is correctly imported:
www.fleischhacker.biz/TIFF/correct1.jpg
www.fleischhacker.biz/TIFF/correct2jpg
 
the image created with libtiff:
 <http://www.fleischhacker.biz/TIFF/incorrect1.jpg>
www.fleischhacker.biz/TIFF/incorrect1.jpg
 <http://www.fleischhacker.biz/TIFF/incorrect2.jpg>
www.fleischhacker.biz/TIFF/incorrect2.jpg

 

Best regards

Tom Oldenkott


 

 

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD>
<META http-equiv=3DContent-Type content=3D"text/html; =
charset=3Dus-ascii">
<META content=3D"MSHTML 6.00.2900.2802" name=3DGENERATOR></HEAD>
<BODY>
<DIV><FONT face=3DVerdana size=3D2><SPAN=20
class=3D042225606-10012006>Hello,</SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN=20
class=3D042225606-10012006></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DVerdana><SPAN class=3D042225606-10012006><FONT =
size=3D2>ich have ab=20
problem creating a multipage tiff image. The 8 byte image file header is =
ok, but=20
something is going wrong in the IFD. The beginning of the IFD consists =
of a=20
2-byte count of the number of directory (i. e., the number of =
fields).&nbsp;My=20
image has 16 tags and the value has to be (in hex)&nbsp;"10 00", hasn't=20
it?&nbsp;</FONT></SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN class=3D042225606-10012006>I =
need these=20
images for a special import process. I have a full funcionally sample =
(which is=20
not created by me) where the IFD design is correct. But when I create an =

multipage tiff image with the lifftib library I get other values at this =

postion. Sometimes it is for example FF FF. By checking these images for =
the=20
special import process it returns a failure. It can't read the correct =
count of=20
the tags (FF FF instead of 10 00).</SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN=20
class=3D042225606-10012006></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN class=3D042225606-10012006>I =
post some=20
screenshots for a better understanding and in hope that somebody can =
help=20
me.</SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN=20
class=3D042225606-10012006></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN =
class=3D042225606-10012006>example which is=20
correctly imported:</SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN class=3D042225606-10012006><A=20
href=3D"http://www.fleischhacker.biz/TIFF/correct1.jpg">www.fleischhacker=
.biz/TIFF/correct1.jpg</A></SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN =
class=3D042225606-10012006><SPAN=20
class=3D042225606-10012006><A=20
href=3D"http://www.fleischhacker.biz/TIFF/correct2jpg">www.fleischhacker.=
biz/TIFF/correct2jpg</A></SPAN></SPAN></FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DVerdana size=3D2><SPAN class=3D042225606-10012006>the =
image created=20
with libtiff:</SPAN></FONT></DIV>
<DIV><SPAN class=3D042225606-10012006><A=20
href=3D"http://www.fleischhacker.biz/TIFF/incorrect1.jpg"><FONT =
face=3DVerdana=20
size=3D2>www.fleischhacker.biz/TIFF/incorrect1.jpg</FONT></A></SPAN></DIV=
>
<DIV><SPAN class=3D042225606-10012006><SPAN =
class=3D042225606-10012006><A=20
href=3D"http://www.fleischhacker.biz/TIFF/incorrect2.jpg"><FONT =
face=3DVerdana=20
size=3D2>www.fleischhacker.biz/TIFF/incorrect2.jpg</FONT></A></SPAN></SPA=
N></DIV>
<P style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Verdana" align=3Dleft><SPAN=20
class=3D042225606-10012006></SPAN>&nbsp;</P>
<P style=3D"FONT-SIZE: 10pt; FONT-FAMILY: Verdana" align=3Dleft><SPAN=20
class=3D042225606-10012006></SPAN>B<SPAN class=3D042225606-10012006>est=20
regards</SPAN><BR><BR><SPAN class=3D042225606-10012006>Tom =
Oldenkott</SPAN></P>
<P style=3D"FONT-SIZE: 8pt; FONT-FAMILY: Verdana"><FONT =
size=3D2></FONT><FONT=20
size=3D2></FONT><FONT size=3D2></FONT><BR>&nbsp;</P>
<DIV>&nbsp;</DIV></BODY></HTML>

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_______________________________________________
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http://lists.maptools.org/mailman/listinfo/tiff
http://www.remotesensing.org/libtiff/
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