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Message-ID: <DE4BA66ED7704789BA9B35B15B03C849@vitbdc.com>
From: "Sanjeev Balachander" <sanjeevb@vitinfotech.com>
To: <Tiff@lists.maptools.org>
Date: Wed, 1 Apr 2009 20:33:38 +0530
Organization: VIT Infotech
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Subject: [Tiff] Needs help on Jpeg7 compression & decompression for tiff
	images
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Hi,

I am currently working on implementing the JPEG 7 compression for tiff =
images and encountered few difficulties in implementing the same. Needs =
some help on resolving it.

Currently if we look into the tiff image using binary image editor we =
can see that the JPEG 7 compression information is appearing in 2 =
different places one pointed by tag 273 Stripoffsets and other by tag =
347 known as JPEGTables.  In 347 we have global slots JPEGTables =
information and tag 273 contains offset to the other image information.  =
Now i am not sure how to take these 2 information before putting on to =
the JPEG De-compressor.  Do i need to take both of them? or i can ignore =
any one of them?

Also i am facing the problem of putting the image information to the =
JPEG tables when compressing the image.  What steps do i have to take =
for putting these data when placing them on JPEGTables(Tag 347) and the =
image data (Placed in offeset of tag 273) ?

Kindly provide me some information on these if any one know about it.


Regards
Balachander, Sanjeev
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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=3Diso-8859-1">
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<BODY bgColor=3D#ffffff>
<DIV><FONT face=3DArial size=3D2>Hi,</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>I am currently working on implementing =
the JPEG 7=20
compression for tiff images and encountered few difficulties in =
implementing the=20
same. Needs some help on resolving it.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Currently if we look into the tiff =
image using=20
binary image editor we can see that the JPEG 7 compression information =
is=20
appearing in 2 different places one pointed by tag 273 Stripoffsets and =
other by=20
tag 347 known as JPEGTables.&nbsp; In 347 we have&nbsp;global=20
slots&nbsp;JPEGTables&nbsp;information and tag 273 contains offset to=20
the&nbsp;other image information.&nbsp; Now i am not sure how to take =
these 2=20
information before putting on to the JPEG De-compressor.&nbsp; Do i need =
to take=20
both of them? or i can ignore any one of them?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Also i am facing the problem of putting =
the image=20
information to the JPEG tables when&nbsp;compressing the image.&nbsp; =
What steps=20
do i have to take&nbsp;for putting these data&nbsp;when placing them on=20
JPEGTables(Tag 347)&nbsp;and the image data (Placed in offeset of tag=20
273)&nbsp;?</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Kindly provide me some information on =
these if any=20
one know about it.</FONT></DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV><FONT face=3DArial size=3D2>Regards</FONT></DIV>
<DIV><FONT face=3DArial size=3D2>Balachander, =
Sanjeev</FONT></DIV></BODY></HTML>

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