Optimize images for use on the web

The script optimg.bash creates a bash-function optimg which takes a list of image-files to process for optimizing their size.

Its intended use is to optimize images in a website to improve the rating on services like "Google PageSpeed".

Get Going

Here is a seqence of commands to get going.

source optimg.bash
rsync -a orig/ test/
optimg test/*

The output should look something like this, stating what files were processed and a percentage on how much the filesize was reduced, if any. 100 is the original filesize.

PNG-image:  test/1start.png  .......................................  99.15
JPEG-image: test/bakgrund-topp.jpg  ................................   8.74
JPEG-image: test/footer.jpg  .......................................  76.83
Saved  43  kB.

Demonstration

Here is an asciicast of the commands to get going.

Tools used

External tools are used to optimize the images.

• JPEG uses jpegtran.
• PNG uses optipng and pngcrush.

Credits and equal projects

I was inspired by the Gist made by lgiraudel, lgiraudel/optimize.sh. I just wanted a simpler script.

Revision

v1.0.0 (2015-06-23)

• First release.

 .  
..:  Copyright (c) 2015 Mikael Roos, me@mikaelroos.se