Hi @xrvel,
Thank you for your message.
The Imagick library may be installed on your server, but it does not support the AVIF format. And that causes this problem.
An example of the correct server configuration can be found here. The link to your current configuration can be found in the Help Center tab on plugin settings screen.
Note the items marked in red. If the values marked in red do not appear in your case, it means that your server does not meet the technical requirements. Pay attention to WEBP in the list of supported extensions for the Imagick library.
Best, Mateusz
If i only use webp, is there any difference between the job done by GD , or Imagick?
Thanks for the quick reply.
@xrvel In general, the quality of the conversion is very close. Imagick handles colors better in certain situations. However, if you care about the maximum quality, then I recommend the AVIF format. The images will have about 40% less weight compared to WebP, while maintaining even better quality.
Thanks for the explanation.