PSI – How to Optimize Images

I have been using ewww for years. While running a Google PageSpeed Insights test for a client’s site, I noticed several images aren’t up to the mark. EWWW said it’s compressed. So, downloaded the optimized files from Google PSI and compared with the original images.

ImageMagick has a nice command line utility called identify that helps to find the “Q”uality of the image compression. To find it out, use the following command…

identify -format '%Q' imagename.jpg

Make sure your server has imagemagick. lol.

It looks like Google uses lossy compression with 85% of the original image quality. So, a loss of 15%.

Later, I noticed that it is a common query in recent times in the official PSI forums too. I am glad I am not alone. 🙂


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