Filter to Sell Media that adds a new image size for a new image aspect ratio used in Sell Media archives and shortcodes

sell-media-image-size-filter.php

<?php
/**
 * Plugin Name: Sell Media Image Size Filter
 * Plugin URI: https://graphpaperpress.com/plugins/sell-media/
 * Description: Filter to Sell Media that adds a new image size for a new image aspect ratio used in Sell Media archives and shortcodes
 * Version: 1.0.0
 * Author: Thad Allender
 * Author URI: https://graphpaperpress.com
 * Author Email: [email protected]
 * Text Domain: sell_media
 * Domain Path: languages
 * License: GPL2
 */
 
 /**
  * Filters the size of thumbnail in Sell Media
  *
  * By default, Sell Media use the "Medium" size image. Depending on your unique situation,
  * you might want to use a different size. While you can control the size of images
  * by visiting the Settings -> Media page in WordPress, changing this might effect areas
  * in your website that you would rather keep "as is." By using the "sell_media_thumbnail" filter,
  * we can tell Sell Media to use a different image size called "custom-thumbnail"
  * on archives and in shortcodes.
  */
 function  sell_media_new_thumbnail_size(){
	return 'custom-thumbnail';
 }
 add_filter( 'sell_media_thumbnail', 'sell_media_new_thumbnail_size' );
 
 /**
  * Adds new image size to WordPress
  *
  * You can change 600 and 600 below to be any size that you want.
  * As is, the new thumbnail sizes will be cropped into 600px x 600px square.
  * The last parameter "true" in the add_image_size function tells WordPress
  * to either crop the image to exactly 600 x 600 or "false" for only cropping
  * the longest side and keeping the image proportional. To recrop previously
  * uploaded images to this new size, you need to install
  * the Regenerate Thumbnails plugin (free at WordPress.org).
  */
function sell_media_add_image_size(){
	add_image_size( 'custom-thumbnail', 600, 600, true );
}
add_action( 'after_setup_theme', 'sell_media_add_image_size' );