// Parent Theme functions.php Code for Registering Thumbnails
// Register Thumbnails

/////////////////////////////////////



if ( function_exists( 'add_theme_support' ) ) {

add_theme_support( 'post-thumbnails' );

set_post_thumbnail_size( 660, 400, true );

add_image_size( 'post-thumb', 660, 400, true );

add_image_size( 'medium-thumb', 400, 242, true );

add_image_size( 'small-thumb', 270, 164, true );

}

// Child Theme functions.php

function remove_parent_theme_features() {
    remove_theme_support( 'post-thumbnails' );
}

add_filter( 'intermediate_image_sizes_advanced', 'remove_parent_image_sizes' );

function remove_parent_image_sizes( $sizes ) {
    unset( $sizes['post-thumb'] );
    return $sizes;
}

if ( function_exists( 'add_theme_support' ) ) {

add_theme_support( 'post-thumbnails' );

set_post_thumbnail_size( 1000, 350, true );

add_image_size( 'post-thumb', 1000, 350, true );

}