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神经网络昆斯林的新闻组分类2006

[6]  Where can I get JPEG software?

Most of the programs described in this section are available by FTP.
If you don't know how to use FTP, see the FAQ article "How to find sources".
(If you don't have direct access to FTP, read about ftpmail servers in the
same article.)  That article appears regularly in news.answers, or you can
get it by sending e-mail to [e-mail] with
"send usenet/news.answers/finding-sources" in the body.  The "Anonymous FTP
List FAQ" may also be helpful --- it's usenet/news.answers/ftp-list/faq in
the news.answers archive.

NOTE: this list changes constantly.  If you have a copy more than a couple
months old, get the latest JPEG FAQ from the news.answers archive.


[6A]  If you are looking for "canned" software, viewers, etc:

The first part of this list is system-specific programs that only run on one
kind of system.  If you don't see what you want for your machine, check out
the portable JPEG software described at the end of the list.  Note that this
list concentrates on free and shareware programs that you can obtain over
Internet; but some commercial programs are listed too.

X Windows:

XV (shareware, $25) is an excellent viewer for JPEG, GIF, and many other
image formats.  It can also do format conversion and some simple image
manipulations.  It's available for FTP from export.lcs.mit.edu (18.24.0.12),
file contrib/xv-3.00.tar.Z.  Version 3.00 is a major upgrade with support
for 24-bit displays and many other improvements; however, it is brand new
and still has some bugs lurking.  If you prefer not to be on the bleeding
edge, stick with version 2.21, also available from export.  Note that
version 2.21 is not a good choice if you have a 24-bit display (you'll get
only 8-bit color), nor for converting 24-bit images to JPEG.  But 2.21 works
fine for converting GIF and other 8-bit images to JPEG.  CAUTION: there is a
glitch in version 2.21: be sure to check the "save at normal size" checkbox
when saving a JPEG file, or the file will be blurry.

Another good choice for X Windows is John Cristy's free ImageMagick package,
also available from export.lcs.mit.edu, file contrib/ImageMagick.tar.Z.
This package handles many image processing and conversion tasks.  The
ImageMagick viewer handles 24-bit displays correctly; for colormapped
displays, it does better (though slower) color quantization than XV or the
basic free JPEG software.

Both of the above are large, complex packages.  If you just want a simple
image viewer, try xloadimage or xli.  xloadimage supports JPEG in its latest
release, 3.03.  xloadimage is free and available from export.lcs.mit.edu,
file contrib/xloadimage-3.03.tar.Z.  xli is a variant version of xloadimage,
said by its fans to be somewhat faster and more robust than the original.
(The current xli is indeed faster and more robust than the current
xloadimage, at least with respect to JPEG files, because it has the IJG v4
decoder while xloadimage 3.03 is using a hacked-over v1.  The next
xloadimage release will fix this.)  xli is also free and available from
export.lcs.mit.edu, file contrib/xli.1.14.tar.Z.  Both programs are said
to do the right thing with 24-bit displays.


MS-DOS:

This covers plain DOS; for Windows or OS/2 programs, see the next headings.

One good choice is Eric Praetzel's free DVPEG, which views JPEG and GIF files.
The current version, 2.5, is available by FTP from sunee.uwaterloo.ca
(129.97.50.50), file pub/jpeg/viewers/dvpeg25.zip.  This is a good basic
viewer that works on either 286 or 386/486 machines.  The user interface is
not flashy, but it's functional.

Another freeware JPEG/GIF/TGA viewer is Mohammad Rezaei's Hiview.  The
current version, 1.2, is available from Simtel20 and mirror sites (see NOTE
below), file msdos/graphics/hv12.zip.  Hiview requires a 386 or better CPU
and a VCPI-compatible memory manager (QEMM386 and 386MAX work; Windows and
OS/2 do not).  Hiview is currently the fastest viewer for images that are no
bigger than your screen.  For larger images, it scales the image down to fit
on the screen (rather than using panning/scrolling as most viewers do).
You may or may not prefer this approach, but there's no denying that it
slows down loading of large images considerably.  Note: installation is a
bit tricky; read the directions carefully!

A shareware alternative is ColorView for DOS ($30).  This is easier to
install than either of the two freeware alternatives.  Its user interface is
also much spiffier-looking, although personally I find it harder to use ---
more keystrokes, inconsistent behavior.  It is faster than DVPEG but a
little slower than Hiview, at least on my hardware.  (For images larger than
screen size, DVPEG and ColorView seem to be about the same speed, and both
are faster than Hiview.)  The current version is 2.1, available from
Simtel20 and mirror sites (see NOTE below), file msdos/graphics/dcview21.zip.
Requires a VESA graphics driver; if you don't have one, look in vesadrv2.zip
or vesa-tsr.zip from the same directory.  (Many recent PCs have a built-in
VESA driver, so don't try to load a VESA driver unless ColorView complains
that the driver is missing.)

A second shareware alternative is Fullview, which has been kicking around
the net for a while, but I don't know any stable archive location for it.
The current (rather old) version is inferior to the above viewers anyway.
The author tells me that a new version of Fullview will be out shortly
and it will be submitted to the Simtel20 archives at that time.

The well-known GIF viewer CompuShow (CSHOW) supports JPEG in its latest
revision, 8.60a.  However, CSHOW's JPEG implementation isn't very good:
it's slow (about half the speed of the above viewers) and image quality is
poor except on hi-color displays.  Too bad ... it'd have been nice to see a
good JPEG capability in CSHOW.  Shareware, $25.  Available from Simtel20 and
mirror sites (see NOTE below), file msdos/gif/cshw860a.zip.

Due to the remarkable variety of PC graphics hardware, any one of these
viewers might not work on your particular machine.  If you can't get *any*
of them to work, you'll need to use one of the following conversion programs
to convert JPEG to GIF, then view with your favorite GIF viewer.  (If you
have hi-color hardware, don't use GIF as the intermediate format; try to
find a TARGA-capable viewer instead.  VPIC5.0 is reputed to do the right
thing with hi-color displays.)

The Independent JPEG Group's free JPEG converters are FTPable from Simtel20
and mirror sites (see NOTE below), file msdos/graphics/jpeg4.zip (or
jpeg4386.zip if you have a 386 and extended memory).  These files are DOS
compilations of the free source code described in section 6B; they will
convert JPEG to and from GIF, Targa, and PPM formats.

Handmade Software offers free JPEG<=>GIF conversion tools, GIF2JPG/JPG2GIF.
These are slow and are limited to conversion to and from GIF format; in
particular, you can't get 24-bit color output from a JPEG.  The major
advantage of these tools is that they will read and write HSI's proprietary
JPEG format as well as the Usenet-standard JFIF format.  Since HSI-format
files are rather widespread on BBSes, this is a useful capability.  Version
2.0 of these tools is free (prior versions were shareware).  Get it from
Simtel20 and mirror sites (see NOTE below), file msdos/graphics/gif2jpg2.zip.
NOTE: do not use HSI format for files to be posted on Internet, since it is
not readable on non-PC platforms.

Handmade Software also has a shareware image conversion and manipulation
package, Image Alchemy.  This will translate JPEG files (both JFIF and HSI
formats) to and from many other image formats.  It can also display images.
A demo version of Image Alchemy version 1.6.2 is available from Simtel20 and
mirror sites (see NOTE below), file msdos/graphics/alch162.zip.

NOTE ABOUT SIMTEL20: The Internet's key archive site for PC-related programs
is Simtel20, full name wsmr-simtel20.army.mil (192.88.110.20).  Simtel20
runs a non-Unix system with weird directory names; where this document
refers to directory (eg) "msdos/graphics" at Simtel20, that really means
"pd1:<msdos.graphics>".  If you are not physically on MILnet, you should
expect rather slow FTP transfer rates from Simtel20.  There are several
Internet sites that maintain copies (mirrors) of the Simtel20 archives;
most FTP users should go to one of the mirror sites instead.  A popular USA
mirror site is oak.oakland.edu (141.210.10.117), which keeps Simtel20 files
in (eg) "/pub/msdos/graphics".  If you have no FTP capability, you can
retrieve files from Simtel20 by e-mail; see informational postings in
comp.archives.msdos.announce to find out how.  If you are outside the USA,
consult the same newsgroup to learn where your nearest Simtel20 mirror is.

Microsoft Windows:

There are several Windows programs capable of displaying JPEG images.
(Windows viewers are generally slower than DOS viewers on the same hardware,
due to Windows' system overhead.  Note that you can run the DOS conversion
programs described above inside a Windows DOS window.)

The newest entry is WinECJ, which is free and EXTREMELY fast.  Version 1.0
is available from ftp.rahul.net, file /pub/bryanw/pc/jpeg/wecj.zip.
Requires Windows 3.1 and 256-or-more-colors mode.  This is a no-frills
viewer with the bad habit of hogging the machine completely while it
decodes; and the image quality is noticeably worse than other viewers.
But it's so fast you'll use it anyway, at least for previewing...

JView is freeware, fairly fast, has good on-line help, and can write out the
decompressed image in Windows BMP format; but it can't create new JPEG
files, and it doesn't view GIFs.  JView also lacks some other useful
features of the shareware viewers (such as brightness adjustment), but it's
an excellent basic viewer.  The current version, 0.9, is available from
ftp.cica.indiana.edu (129.79.20.84), file pub/pc/win3/desktop/jview090.zip.
(Mirrors of this archive can be found at some other Internet sites,
including wuarchive.wustl.edu.)

WinJPEG (shareware, $20) displays JPEG,GIF,Targa,TIFF, and BMP image files;
it can write all of these formats too, so it can be used as a converter.
It has some other nifty features including color-balance adjustment and
slideshow.  The current version is 2.1, available from Simtel20 and mirror
sites (see NOTE above), file msdos/windows3/winjp210.zip.  (This is a slow
286-compatible version; if you register, you'll get the 386-only version,
which is roughly 25% faster.)

ColorView is another shareware entry ($30).  This was an early and promising
contender, but it has not been updated in some time, and at this point it
has no real advantages over WinJPEG.  If you want to try it anyway, the
current version is 0.97, available from ftp.cica.indiana.edu, file
pub/pc/win3/desktop/cview097.zip.  (I understand that a new version will
be appearing once the authors are finished with ColorView for DOS.)

DVPEG (see DOS heading) also works under Windows, but only in full-screen
mode, not in a window.

OS/2:

The following files are available from hobbes.nmsu.edu (128.123.35.151).
Note: check /pub/uploads for more recent versions --- the hobbes moderator
is not very fast about moving uploads into their permanent directories.
/pub/os2/2.x/graphics/jpegv4.zip
    32-bit version of free IJG conversion programs, version 4.
/pub/os2/all/graphics/jpeg4-16.zip
    16-bit version of same, for OS/2 1.x.
/pub/os2/2.x/graphics/imgarc12.zip
    Image Archiver 1.02: image conversion/viewing with PM graphical interface.
    Strong on conversion functions, viewing is a bit weaker.  Shareware, $15.
/pub/os2/2.x/graphics/pmjpeg11.zip
    PMJPEG 1.1: OS/2 2.x port of WinJPEG, a popular viewer for Windows
    (see description in Windows section).  Shareware, $20.
/pub/os2/2.x/graphics/pmview85.zip
    PMView 0.85: JPEG/GIF/BMP viewer.  GIF viewing very fast, JPEG viewing
    fast if you have huge amounts of RAM, otherwise about the same speed
    as the above programs.  Strong 24-bit display support.  Shareware, $20.

Macintosh:

Most Mac JPEG programs rely on Apple's JPEG implementation, which is part of
the QuickTime system extension; so you need to have QuickTime installed.
To use QuickTime, you need a 68020 or better CPU and you need to be running
System 6.0.7 or later.  (If you're running System 6, you must also install
the 32-bit QuickDraw extension; this is built-in on System 7.)  You can get
QuickTime by FTP from ftp.apple.com, file dts/mac/quicktime/quicktime.hqx.
(As of 11/92, this file contains QuickTime 1.5, which is better than QT 1.0
in several ways.  With respect to JPEG, it is marginally faster and
considerably less prone to crash when fed a corrupt JPEG file.  However,
some applications seem to have compatibility problems with QT 1.5.)

Mac users should keep in mind that QuickTime's JPEG format, PICT/JPEG, is
not the same as the Usenet-standard JFIF JPEG format.  (See section 10 for
details.)  If you post images on Usenet, make sure they are in JFIF format.
Most of the programs mentioned below can generate either format.

The first choice is probably JPEGView, a free program for viewing images
that are in JFIF format, PICT/JPEG format, or GIF format.  It also can
convert between the two JPEG formats.  The current version, 2.0, is a big
improvement over prior versions.  Get it from sumex-aim.stanford.edu
(36.44.0.6), file /info-mac/app/jpeg-view-20.hqx.  Requires System 7 and
QuickTime.  On 8-bit displays, JPEGView usually produces the best color
image quality of all the currently available Mac JPEG viewers.  JPEGView can
view large images in much less memory than other Mac viewers; in fact, it's
the only one that can deal with JPEG images much over 640x480 pixels on a
typical 4MB Mac.  Given a large image, JPEGView automatically scales it down
to fit on the screen, rather than presenting scroll bars like most other
viewers.  (You can zoom in on any desired portion, though.)  Some people
like this behavior, some don't.  Overall, JPEGView's user interface is very
well thought out.

GIFConverter, a shareware ($40) image viewer/converter, supports JFIF and
PICT/JPEG, as well as GIF and several other image formats.  The latest
version is 2.3.2.  Get it from sumex-aim.stanford.edu, file
/info-mac/art/gif/gif-converter-232.hqx.  Requires System 6.0.5 or later.
GIFConverter is not better than JPEGView as a plain JPEG/GIF viewer, but
it has much more extensive image manipulation and format conversion
capabilities, so you may find it worth its shareware fee if you do a lot of
playing around with images.  Also, the newest version of GIFConverter can
load and save JFIF images *without* QuickTime, so it is your best bet if
your machine is too old to run QuickTime.  (But it's faster with QuickTime.)
Note: If GIFConverter runs out of memory trying to load a large JPEG, try
converting the file to GIF with JPEG Convert, then viewing the GIF version.

JPEG Convert, a Mac version of the free IJG JPEG conversion utilities, is
available from sumex-aim.stanford.edu, file /info-mac/app/jpeg-convert-10.hqx.
This will run on any Mac, but it only does file conversion, not viewing.
You can use it in conjunction with any GIF viewer.

Previous versions of this FAQ recommended Imagery JPEG v0.6, a JPEG<=>GIF
converter based on an old version of the IJG code.  If you are using this