Using WordPress 6.02, PHP 7.4.32, tagdiv newsmagazine theme.
With imagick, with the plugin set Default JPEG Quality: 90, the thumbnail quality was better than the original thumbnail quality.
Using the GD library, the thumbnail quality was a slightly less with imagick, but the thumbnail was higher quality is higher quality than original GD thumbnail generation.
Using JPEG Quality: 80 generates about the same quality as original for imagick and GD.
The plugin could use a regenerate date range and some way to identify which images are being used that match the image size names.
I am impressed that it has process recovery and will restart where it was interupted.
There is a flaw with the “Delete Unselected Thumbnails” function where if there is a base image which has a size in the name, e.g., 400×400, it may get deleted as a thumb for a different image. It also removes thumbnails generated for “Simple Local Avatars” plugin that should not be deleted.
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