Information
My original CR2 cropped image of 3515px by 2510px exported at the different JPG quality values and reduced down to 800px by 571px.
Then all WebP images created from 100 quality 800 by 571 jpg image with different quality values in the command, being:
cwebp -q QQQ file.jpg -o file.webp
where 'QQQ' is the quality value. Command 'cwebp' installed on Ubuntu with:
sudo apt-get install webp