Tools for JPEG optimization? [closed]

Answer 1

ImageOptim is really slick. The command line option posted by the author will populate the GUI and show progress. I used jpegtran for optimizing and converting to progressive, then ImageOptim for further progressive optimizations and for other file types.

Reuse of script code also found in this forum (all files replaced in place):

jpegtran

for file in $(find $DIR -type f \( -name "*.jpg" -or -name "*.jpeg" -or -name "*.JPG" \)); do
    echo found $file for optimizing...
    jpegtran -copy comments -optimize -progressive -outfile $file $file
done

ImageOptim

for file in $(find $DIR -type f \( -name "*.jpg" -or -name "*.png" -or -name "*.gif" \)); do
do
    echo found $file for optimizing...
    open -a ImageOptim.app $file
done

Answer 2

[WINDOWS ONLY]

RIOT(Radical Image Optimization Tool) This is the greatest image optimization tool I have found!

http://luci.criosweb.ro/riot/

You can easily get a 10MB image down to 800KB through sub-sampling. It supports PNG, GIF, and JPEG. It even integrates into context menus so you can send pictures straight there. Allows you to rotate, re-size, compress to specified KB's, and more. Also has plugins for GIMP and IrfanView and other things.

There is also a DLL available if you want to incorporate it into your own programs or java script / c++ program.

Another alternative is http://pnggauntlet.com/ PNGGAUNTLET takes forever but it does a pretty good job.

[WINDOWS ONLY]

Answer 3

In case anyone's looking, I've written an offline version of Yahoo's Smush.it. It will losslessly optimise pngs, jpgs and gifs (animated and static):

http://github.com/thebeansgroup/smush.py

Answer 4

I use libjpeg for lossless operations. It contains a command-line tool jpegtran that can do all you want. With the commandline option -copy none all the metadata is stripped, and -optimize does a lossless optimization of the Huffmann compression. You can also convert the images to progressive mode with -progressive, but that might cause compatibility problems (does anyone know more about that?)

Answer 5

Tried a number of the suggestions above - I personally was after lossless compression.

My sample image had an original size of 67,737 bytes.

Using kraken.io, it went down to 64,718 Using jpegtran, it went down to 64,718 Using yahoo smush-it, it went down to 61,746 Using imagemagick (-strip), it went down to 65,312

The smush.py option looks promising, but the installation was too complex for me to do quickly

jpegrescan looks promising too, but seems to be unix and I'm using windows

jpegmini is NOT lossless, but I can't tell the difference (down to 22,172)

plinth's Altrasoft jpegstripper app does not work on my windows 7

jpegoptim is not windows - no good for me

Riot (keeping quality at 100%) got it down to 63,416 and with chroma subsampling set to high, it got it down to 61,912 - I don't know if that is lossless or not though, and I think it looks lighter than the original.

So my verdict is yahoo smushit if it must be lossless

Answer 6

I recommend to use JpegOptim, it's free and really nice, you can specify the quality, the size you want ... And easy to use in command line.

JpegOptim