How do I use the image optimisation feature
For users who would like clear instruction on how to use this feature, we created a short video that takes you through the step-by-step process of optimizing any or all existing and future images.
How much will I save by compressing my images?
While there is no definitive and exact figure for how much data you will save by optimizing your images using Lossy or Lossless compression, the following examples should serve as a good guide.
To test out the kind of results that could be achieved, the same image was compressed using both the Lossy and Lossless method. The results are as follows:
With Lossy compression enabled, the sample image was compressed from 230.26 KB to 64.92 KB, giving an almost 75% reduction in size.
With Lossless compression enabled, the sample image was compressed from 230.26 KB to 172.18 KB, giving just over 25% reduction in size.
For more detail on the compression process and the results achieved, take a look at the “Lossy vs Lossless image compression – A guide to the trade-off between image size and quality” blog.
Google Pagespeed says the images need more compression
PageSpeed Insights uses lossy compression instead of lossless. That means PageSpeed reduces the quality of your images in order to achieve the results they recommend. Instead of lossless compression, PageSpeed uses the freely available ImageMagick utility at quality 85 to compress images.
We use a slightly better setting to compress images and PageSpeed may think this is inadequate. You can manually set the compression level to Custom and select the maximum compression to ensure that PageSpeed does not flag your images.
What is auto compress ? How does it work ?
During the process of uploading images to the media library, the plugin simultaneously sends the images to one of the API servers, where the incoming material is processed and sent back in optimised form. Afterwards, the plugin saves the image version with a reduced file size in the media library. The image can be reverted to the original if needed.
The optimization of images – including thumbnails – is conducted in the background and outside of the view of the user.
Will the optimised images remain on my site if I uninstall the plugin?
Yes, they will. The plugin simply replaces the image files on your sites with the ones optimised by us.
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