Installing JPEGTRAN on a Mac or Unix/Linux
JPEGtran is cool because it lets you optimize JPEG images losslessly by:
- Stripping meta data (meta is sometimes bulky and useless for web display)
- Optimizing Huffman tables or
- Convert a JPEG to progressive encoding
From my experience 1 is more important than 2 or 3 and 3 gives better results than 2 for images over 10K
Installation
I never had to install jpegtran before because all unix/linux machines I've touched already have it. And on windows you just copy a binary somewhere in your path.
Well, I got this MacBook now and it doesn't have jpegtran so had to figure it out myself. Here's how you can do it, worked for me on Mac OS should work on any unix/linux too.
BTW, jpegtran is part of a package of few tools known as libjpeg, so you'll be installing a few programs not only jpegtran.
- Get the source code from here. It's the file called
jpegsrc.v6b.tar.gz. Using cURL you can download like:
curl http://www.ijg.org/files/jpegsrc.v6b.tar.gz > /tmp/libjpeg.tar.gz - Uncompres the package, e.g.
tar -xzvf /tmp/libjpeg.tar.gz - go to the directory that contains the uncompressed code, e.g.
cd /tmp/jpeg-6b ./configuresudo make install
Done.
You can test your shiny new set of tools like this and get some help information about the various options:
> jpegtran -h > cjpeg -h > djpeg -h > rdjpgcom -h > wrjpgcom -h
You also test by optimizing my book cover from Amazon like:
curl http://ecx.images-amazon.com/images/I/41ckBp3bBUL._SL500_AA240_.jpg > oojs.jpg jpegtran -copy none -progressive oojs.jpg > oojs-opt.jpg
This gives you 10% smaller file with not a pixel of quality loss. Not bad, eh, for a minute of work, or less.
This entry was posted on Friday, January 16th, 2009 and is filed under images, performance, tools. You can follow any responses to this entry through the RSS 2.0 feed. You can leave a response, or trackback from your own site.
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January 16th, 2009 at 5:28 am
The ubuntu package : http://packages.ubuntu.com/intrepid/libjpeg-progs
aptitude install libjpeg-progs
January 18th, 2009 at 3:24 pm
Perhaps amazon should use jpegtran – the financial saving could be significant
January 19th, 2009 at 1:25 pm
Thanks Mathieu.
David, yes, definitely. Virtually every site out there can benefit from running jpegtran. I did an experiment with 10 000 random images from all over the web and this was the average – 11.45% savings if you run jpegtran. Details: http://yuiblog.com/blog/2008/12/05/imageopt-4/
January 22nd, 2009 at 4:23 pm
If you use a mac have a look at ImageOptim.
This will run your images through numerous JPEG and PNG optimizers and get the best from each,
William
February 10th, 2009 at 2:31 pm
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April 9th, 2009 at 7:48 am
Perhaps amazon should use jpegtran – the financial saving could be significant
December 7th, 2009 at 4:31 pm
It’s amazin ) up to 80% compress!
Thanx!
January 2nd, 2010 at 4:55 pm
If you’re copying and pasting instructions from this article, you’ll run into errors when unzipping the .tar.gz file because the filename has since been updated. Check the home page for the most recent version of “jpegsrc”.
http://www.ijg.org/
January 28th, 2010 at 10:43 am
I wrapped your suggestions for jpegtran in a Perl script that searches for JPEGs within a given path. Works like this:
$ ./optimize_jpegs.pl /path/to/you/images
Script is available here:
http://www.mikebrittain.com/blog/2010/01/27/batch-processing-your-jpegs-with-jpegtran/
August 10th, 2010 at 4:52 am
Hello, the new package (v8b) can’t compile on MAC, there’s some problem with the configure script.
November 28th, 2010 at 10:17 pm
Stoyan nice job. Concise and easy to follow instructions. I’ve also used your tips for compiling PNG tools. Thanks!
@Vincent – I was able to download and compile “jpegsrc.v8b.tar.gz” on my Mac G3 iBook. Runs great. The only thing I did differently than these instructions was this:
4. sudo ./configure
But that was just a bad habit mistake on my part… not sure what the consequences would be for this script, but it runs fine.
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March 1st, 2013 at 7:09 am
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March 3rd, 2013 at 10:21 am
I have tried this also, installing to linux. Not as easy as it may appear. But got it working.
March 6th, 2013 at 12:28 pm
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March 28th, 2013 at 1:00 pm
I got this installed on Ubuntu using the command “apt-get install libjpeg-progs”
April 19th, 2013 at 3:09 am
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April 29th, 2013 at 5:33 pm
Hello from 2013! You can do install it on Mac now via:
$ brew install libjpeg
cheers!