WordPress generates several sizes of of uploaded files. When converting them to webp, webp-express, uses each resized image as source when converting to webp. This means that jpeg encoding errors are kept in the webp target and that webp files can never look better than their jpeg counterparts
webp-express could achieve better quality by using the original large source file and do scaling during the encoding. This way we end up with smaller webp files while retaining better visual quality.
WordPress generates several sizes of of uploaded files. When converting them to webp,
webp-express, uses each resized image as source when converting to webp. This means that jpeg encoding errors are kept in the webp target and that webp files can never look better than their jpeg counterpartswebp-expresscould achieve better quality by using the original large source file and do scaling during the encoding. This way we end up with smaller webp files while retaining better visual quality.Examples: