Woocommerce has updated a few times since, but I ran into a confusion when trying to understand how a clients product images were looking blurry as thumbnails on the product page.
The Settings -> Media were set to 300×300
The Appearance -> Customize -> Woocommerce -> Product images were set to 300×300
The themes functions were set to even larger
… yet the thumbnails were stuck at 100×100 pixels. Baffling.
In cases like this, you can create a new function in a new custom plugin to override any other settings.
// resize image gallery thumbnail sizes
add_filter( 'woocommerce_get_image_size_gallery_thumbnail', function( $size ) {
return array(
'width' => 300,
'height' => 300,
'crop' => 0,
);
});Obviously you can change the values to anything you wish, as well as the gallery_thumbnail part to any other image size.
In some instances, you may also need to Regenerate Thumbnails to create the new thumbnail sizes if they don’t already exist.
