Image sizes automatic generation ?

Hello Alex,

I just realized about how much waste is the defaukt behaviour of WordPress core and found your approach which seems to me way more senseful.
BUT…

• I installed and enabled the plugin.
• I added to the functions.php of my child theme a configuration hook based on your github page.
• I finally added a “rwd-image-sizes.php” to the directory of my child theme and this php file contains the full working config array published at your github (https://github.com/justcoded/just-responsive-images/#pre-defined-rwd-set)

But I am surprised about one behaviour that I may have not understood properly.
I was expecting your plugin to avoid auto generation of different image sizes from the wordpress core.
In my case, it does not seem to happen. I still see automatically every single core wordpress image sizes generated. (looking through ftp)
ANd I don’t manage to see the “on-the-fly resizing” that you describe at the time I will display my page from different devices.

Can you advise here ?
WIs it that I did not get the purpose of it or Am I doing sthg wrong ?

Thanks