你可以在jpeg_quality filter 并检查要对其应用筛选器的帖子类型。

add_filter( \'jpeg_quality\', \'my_jpeq_quality\' );
function my_jpeg_quality( $quality ) { 
if ((isset($_GET[\'post_type\']) && $_GET[\'post_type\'] == \'your_post_type\') || (isset($post_type) && $post_type == \'your_post_type\')) :

return 100;  //Set quality here

endif;

 }

add_filter( \'jpeg_quality\', \'wpse_39179_jpeg_quality_for_post_type\' );

function wpse_39179_jpeg_quality_for_post_type( $quality ) {

    if ( ( isset($_GET[\'post_type\'] ) && $_GET[\'post_type\'] == \'post_type_slug\' ) || ( isset( $post_type ) && $post_type == \'post_type_slug\' ) ){

        // For this post type, we want 100% quality
        return \'100\';

    }else{

        // Otherwise, revert back to what was passed into this filter to allow us to modify it elsewhere
        return $quality;

    }

}/* wpse_39179_jpeg_quality_for_post_type() */