Home Image optimisation with Image Magick to improve Page speed on my Wordpress site
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Image optimisation with Image Magick to improve Page speed on my Wordpress site

John Published in 2018-02-14 11:00:44Z

I am having issues with the page speed of my site (Wordpress / AVADA theme), and the majority of the issues are down to images not being optimised. I have done a bit of research and going to use Image Magick.

Here is a report from GT Metrix:


I have this script for converting my images:

convert /Users/james/Desktop/image-magick/santorini.jpg -sampling-factor 4:2:0 -strip -quality 75 -resize 700x466! -interlace JPEG -colorspace RGB -background white -flatten /Users/james/Desktop/image-magick/final/santorini-opt.jpg 

However I want to convert bulk images from one folder (input) to another (output) then add a _output at the end of each image?

At the moment the script does one image at a time with the same name, which isn’t ideal.

Any help on how I can change the above script to do this would be great. I am hoping once I replace my images with these my page speed will increase and stop complaining about the images!


fmw42 Reply to 2018-02-14 17:40:15Z

A shell script is possible. You should strip before setting any settings or operators. If on current ImageMagick, then use -colorspace sRGB if you want non-linear color and RGB if you want linear color. If on very old IM versions then reverse them.

cd path2/inputdirectory
list=$(ls *.jpg)
for img in $list; do
inname=$(convert -ping $img -format "%t" info:)
convert $img -strip -colorspace RGB -resize 700x466! -background white -flatten -interlace JPEG -sampling-factor 4:2:0 -quality 75 path2/outputdirectory/${inname}.jpg
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