A PostScript version of this document
is
available
by
FTP
at
ftp://ftp.uunet/graphicsljpegljfif.ps.gz. There
is
also a
plain text version at ftp:/lftp.uu.net/graphicsljpegljfif.txt.
gz,
but it
is
missing the figures.
The
TIFF
6.0 file format specification
can
be
obtained
by
FTP
from ftp://ftp.sgi.com/graphicsltiffITlFF6.ps.gz. The
JPEG
incorporation scheme found
in
the
TIFF
6.0 spec of
3-June-92 has a number of serious problems.
IJG
does not recommend use of the
TIFF
6.0 design
(TIFF
Compression tag
61.
Instead,
we
recommend the
JPEG
design proposed
by
TIFF
Technical Note
#2
(Compression
tag
7).
Copies of
this Note
can
be obtained from ftp.sgi.com or from ftp:/!
ftp.uu.net/graphicsf]pegl. It
is
expected that the next
revision of the
TIFF
spec will replace the 6.0
JPEG
design
with the Note's design.
Although IJG's own code does not support
TIFFIJPEG,
the free libtitt library uses our library to implement TIFF/
JPEG
per the Note. libtiff
is
available from ftp:/lftp.sgi.
comlgraphics/tiffl.
ARCHIVE
LOCATIONS
The
"official" archive site for this software
is
ftp.uu.net
(Internet address 192.48.96.9). The most recent released
version
can
always be found there
in
directory graphicsl
jpeg. This particular version will
be
archived
as
ftp:/lftp.
uu.
netlgraphics/jpeg/jpegsrc.
v6b.
tar.gz.
If
you
don't have direct Internet access, UUNET's archives
are
also available
via
UUCP;
contact help@uunet.uu.net
for information on retrieving files that
way.
Numerous Internet sites maintain copies of the
UUNET
files. However, only ftp.uu.net
is
guaranteed to
have
the
latest official version.
You
can
also obtain this software in DOS-compatible "zip"
archive format from the
SimTel
archives (ftp:/lftp.simtel.
netlpublsimtelnetlmsdos/graphics/l. or on CompuServe
in
the Graphics Support forum
(GO
CIS:GRAPHSUPI, library
12
'JPEG
Tools". Again, these versions may sometimes
lag
behind the ftp.uu.net release.
The
JPEG
FAQ
(Frequently Asked Questions) article
is
a
useful source of general information about
JPEG.
It
is
updated constantly and therefore
is
not included
in
this
distribution. The
FAQ
is
posted every two weeks to
Usenet newsgroups comp.graphics.misc, news.answers,
and
other groups.
It
is
available
on
the World Wide Web at http://www.faqs.
org/faqsljpeg-faql and other news.answers archive sites.
including the official news.answers archive at rtfm.mit.
edu: ftp://rtfm.mit.edu/pub/usenet/news.answersljpeg-
faql.
If
you
don't have Web or
FTP
access, send e-mail to mail-
seNer@rtfm.mit.edu with body
send usenet/news.answers/jpeg-faq/part1
send usenetlnews.answersf]peg-faqlpart2
RELATED
SOFTWARE
Numerous viewing and image manipulation programs
now support
JPEG.
(Quite a few of them use this library
to do so.)
The
JPEG
FAQ
described above lists some of
the more popular free and shareware viewers, and tells
where
to
obtain them
on
Internet.
If you
are
on
a Unix machine, we highly recommend Jef
Poskanzer's free
PBMPLUS
software, which provides
many useful operations
on
PPM-format image files.
In
particular, it
can
convert
PPM
images to
and
from a
wide range of other formats, thus making cjpegldjpeg
considerably more useful.
The
latest version
is
distributed
by
the NetPBM group,
and
is
available from numerous
sites, notablyftp:lfwuarchive.wustl.edu/graphics/graphicsl
packageslNetPBMI.
Unfortunately PBMPLUS/NETPBM
is
not nearly
as
portable
as
the
IJG
software
is;
you
are
likely to have difficulty
making it work
on
any
non-Unix machine.
A different free
JPEG
implementation, written
by
the
PVRG
group at Stanford,
is
available from ftp:/lhavefun.stanford.edulpubf]pegl.
This program
is
designed for research and experimentation
rather than production use; it
is
slower, harder to use, and
less portable than the
IJG
code, but it
is
easier to
read
and modify. Also, the
PVRG
code supports lossless
JPEG,
which
we
do not.
(On
the other hand, it doesn't do
progressive
JPEG.)
FILE
FORMAT
WARS
Some
JPEG
programs producefiles that are not compatible
with our library.
The root of the problem
is
that the
ISO
JPEG
committee
failed to specify a concrete file format. Some vendors
"filled
in
the blanks"
on
their own, creating proprietary
formats that no one else could
read.
(For
example, none
of the early commercial
JPEG
implementations for the
Macintosh were able to exchange compressed files.)
The file format
we
have adopted
is
called
JFIF
(see
REFERENCES)
This format
has
been agreed to by a
number of major commercial
JPEG
vendors, and
it
has
become the de facto standard.
JFIF
is
a minimal or
"low
end" representation.
We recommend the use of
TIFFIJPEG
(TIFF
revision 6.0
as
modified by
TIFF
Technical Note
#2)
for "high end"
applications that need to record a lot of additional data
about
an
image.
TIFF/JPEG
is fairly new and not yet
widely supported, unfortunately.
The upcoming
JPEG
Part
3 standard defines a file format
called
SPIFF
SPIFF
is
interoperable with
JFIF,
in
the sense that most
JFIF
decoders should be able to
read
the most common
variant of
SPIFF
SPIFF
has
some technical advantages
over
JFIF,
but its major claim to fame
is
simply that it
is
an
official standard rather than
an
informal one. At this point
it
is
unclear whether
SPIFF
will supersede
JFIF
or
whether
JFIF
will remain the de-facto standard.
IJG
intends to
support
SPIFF
once the standard
is
frozen, but
we
have
not decided whether it should become our default output
format or not.
(In
any
case, our decoder will remain capable of reading
JFIF
indefinitely.)
Various proprietary file formats incorporating
JPEG
compression also exist.
We
have little or
no
sympathy for the existence of these
formats. Indeed, one of the original reasons for developing
this free software was to help force convergence on
common, open format standards for
JPEG
files. Don't use
a proprietary file format!
TO
DO
The
major thrust for
v7
will probably
be
improvement of
visual quality.
The current method for scaling the quantization tables
is
known not to
be
very good at low Q values.
We
also intend to investigate block boundary smoothing,
"poor man's variable quantization",
and
other means
of improving quality-vs-file-size performance without
sacrificing compatibility.
In
future versions, we are considering supporting some
of the upcoming
JPEG
Part
3 extensions - principally,
variable quantization
and
the
SPIFF
file format.
As
always, speeding things up
is
of great interest.
Please send
bug
reports, offers of help, etc. to jpeg-info@
uunet.uu.net.
o Exhibit-F
COPYRIGHT
NOTICE.
DISCLAIMER, and
LICENSE:
If you modify libpng you may insert additional notices
immediately following this sentence.
libpng version 12.6, August
15,
2004,
is
Copyright
(c)
2004 Glenn Randers-Pehrson, and
is
distributed according
to the same disclaimer
and
license
as
libpng-1.2.5 with
the following individual added to the list of Contributing
Authors
Cos
min
Truta
libpng versions 1.0.7, July 1,2000, through 1.2.5 - October
3,
2002,
are
Copyright
(c)
2000-2002 Glenn Randers-
Pehrson,
and
are
distributed according to the same
disclaimer
and
license
as
libpng-1.0.6 with the following
individuals added to the list of Contributing Authors
Simon-Pierre Cadieux
Eric
S.
Raymond
Gilles Vollant
and with the following additions to the disclaimer:
There
is
no warranty against interference with your
enjoyment of the library or against infringement.
There
is
no
warranty that our efforts
or
the library will
fulfill any of your particular purposes or needs. This
library
is
provided with
all
faults, and the entire risk of
satisfactory quality, performance, accuracy, and effort
is
with the
user.
libpng versions
0.97,
January 1998, through 1.0.6, March
20,
2000,
are
Copyright
(c)
1998,
1999 Glenn Randers-
Pehrson, and
are
distributed according to the same
disclaimer
and
license
as
libpng-0.96, with the following
individuals added
to
the list of Contributing Authors:
Tom
Lane
Glenn Randers-Pehrson
Willem
van
Schaik
libpng versions 0.89, June 1996, through 0.96, May 1997,
are
Copyright
(c)
1996, 1997 Andreas Dilger Distributed
according to the same disclaimer
and
license
as
libpng-
0.88, with the following individuals added to the list of
Contributing Authors:
John Bowler
Kevin
Bracey
Sam
Bushell
Magnus Holmgren
Greg Roelofs
Tom
Tanner
libpng versions 0.5, May 1995, through 0.88, January
1996,
are
Copyright
(c)
1995, 1996 Guy Eric Schalnat.
Group 42,
Inc
For
the purposes of this copyright
and
license,"Contributing
Authors"
is
defined
as
the following set of individuals:
Andreas Dilger
Dave
Martindale
Guy
Eric Schalnat
Paul
Schmidt
Tim
Wegner
The
PNG
Reference
library
is
supplied
"AS
IS".
The
Contributing Authors
and
Group 42,
Inc.
disclaim
all
warranties, expressed or implied, including, without
limitation, the warranties of merchantability and of fitness
for
any
purpose.
The
Contributing Authors and Group
42,
Inc.
assume no liability for direct. indirect. incidental,
special, exemplary,
or
consequential damages, which may
result from the use of the
PNG
Reference library, even if
advised of the possibility of such damage.
Permission
is
hereby granted to use,
copy,
modify,
and
distribute this source code, or portions hereof,
for
any
purpose, without fee, subject
to
the following
restrictions:
1.
The
origin of this source code must not
be
misrepresented.
2.
Altered versions must be plainly marked
as
such
and
must not
be
misrepresented
as
being the original
source.
3.
This
Copyright notice may not
be
removed or altered
from any source
or
altered source distribution.
The Contributing Authors and Group 42, Inc. specifically
permit, without fee, and encourage the use of this source
code
as
a component to supporting the
PNG
file format
in
commercial products. If you use this source code
in
a product, acknowledgment
is
not required but would
be
appreciated.
A "png_ge'-copyright" function
is
available, for convenient
use
in
"about" boxes and the like: printf("%s",png_ge'-
copyright(NULL)); Also, the
PNG
logo
(in
PNG
format. of
course)
is
supplied
in
the files "pngbar.png"
and
"pngbar.
jpg (88x31) and "pngnow.png" (98x31)
Libpng
is
OSI
Certified Open Source Software.
OSI
Certified Open Source
is
a certification mark of the Open
Source Initiative.
Glenn Randers-Pehrson
glennrp@users.sourceforge.net
August 15, 2004
o Exhibit-G
Copyright
(c)
2001,2003 Keith Packard
Permission to use, copy, modify, distribute,
and
sell this
software
and
its documentation for
any
purpose
is
hereby
granted without fee, provided that the above copyright
notice appear
in
all copies and that both that copyright
notice and this permission notice appear
in
supporting
documentation, and that the name of Keith
Packard
not be
used
in
advertising or publicity pertaining to distribution
of the software without specific, written prior permission.
Keith Packard makes
no
representations about the
suitability of this software for any purpose. It
is
provided
"as
is" without express or implied warranty.
KEITH
PACKARD
DISCLAIMS ALL WARRANTIES
WITH
REGARD
TO
THIS
SOFTWARE, INCLUDING ALL IMPLIED
WARRANTIES
OF
MERCHANTABILITY AND
FITNESS,
IN
NO
EVENT
SHALL
KEITH
PACKARD
BE
LIABLE
FOR
ANY
SPECIAL.
INDIRECT
OR
CONSEQUENTIAL DAMAGES
OR
ANY
DAMAGES
WHATSOEVER
RESULTING
FROM
LOSS
OF
USE,
DATA
OR
PROFITS,
WHETHER
IN
AN
ACTION
OF
CONTRACT.
NEGLIGENCE
OR
OTHER
TORTIOUS
ACTION,
ARISING
OUT
OF
OR
IN
CONNECTION WITH
THE
USE
OR
PERFORMANCE
OF
THIS
SOFTWARE.
LICENSE 6
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