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and subject line Bug#302938: libjpeg-progs: "jpegtran -rotate" algorithm is 
wrong, puts image blocks in the wrong place in the output picture
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From: Robert Fleming <[EMAIL PROTECTED]>
To: Debian Bug Tracking System <[EMAIL PROTECTED]>
Subject: libjpeg-progs: "jpegtran -rotate" algorithm is wrong,
 puts image blocks in the wrong place in the output picture
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Date: Sun, 03 Apr 2005 13:39:24 -0700
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Package: libjpeg-progs
Version: 6b-10
Severity: grave
Justification: causes non-serious data loss

See http://home.comcast.net/~fleminra/jpegtran-bug/

for example input and ouput.  jpegtran incorrectly moves the bottom row of
blocks to the top of the image.  This bug is also present in the JPEG
source distribution at

http://www.ijg.org/files/jpegsrc.v6b.tar.gz

This appears to happen when a dimension of the input JPEG is not a multiple
of the image block size, i.e. an image of height 256 is correctly rotated, but
an image of height 255 is not.

-- System Information:
Debian Release: 3.1
  APT prefers unstable
  APT policy: (500, 'unstable')
Architecture: i386 (i686)
Kernel: Linux 2.6.10-1-k7
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)

Versions of packages libjpeg-progs depends on:
ii  libc6                       2.3.2.ds1-20 GNU C Library: Shared libraries an
ii  libjpeg62                   6b-10        The Independent JPEG Group's JPEG 

-- no debconf information

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Date: Tue, 12 Apr 2005 23:14:59 +0200
To: [EMAIL PROTECTED]
Cc: Robert Fleming <[EMAIL PROTECTED]>
Subject: Re: Bug#302938: libjpeg-progs: "jpegtran -rotate" algorithm is wrong, 
puts image blocks in the wrong place in the output picture
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From: Bill Allombert <[EMAIL PROTECTED]>
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On Sun, Apr 03, 2005 at 11:24:00PM +0200, Bill Allombert wrote:
> > This appears to happen when a dimension of the input JPEG is not a multiple
> > of the image block size, i.e. an image of height 256 is correctly rotated, 
> > but
> > an image of height 255 is not.
> 
> Hello Robert,
> 
> Yes, this is correct, but this is the documented behaviour.
> The JPEG format does not allow perfect rotation when the dimension is
> not a multiple of the image block size.

Hello Robert,

SInce you did not reply, I will assume my answer addressed your concern
and close this bug report.

Thanks for using Debian,
-- 
Bill. <[EMAIL PROTECTED]>

Imagine a large red swirl here. 


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