remove image sizes from media uploader box

Question

I have used custom image sizes in wordpress with "add_image_size" and it's working fine.

I tried to remove default image sized with following code:

function filter_image_sizes( $sizes) {
    unset( $sizes['thumbnail']);
    unset( $sizes['medium']);
    unset( $sizes['large']); 
    return $sizes;
}
add_filter('intermediate_image_sizes_advanced', 'filter_image_sizes');

But these default images sizes are still visible in media upload popup.

Answer 1

Tested on 3.5.1 in my localhost

Using unset and intermediate_image_sizes_advanced will work but only on images uploaded after the function is added. To change it for existing images you need to regenerate them using a plugin ( in essence deleting that image size) or just hide that option from being visible.

// add custom image size
function mytheme_95344() {
        add_image_size('x-la',800,800, false);
}
add_action( 'after_setup_theme', 'mytheme_95344' );

// remove it
function remove_image_size_95344($sizes) {
    unset($sizes['x-la']);
    return $sizes;
}
add_filter('intermediate_image_sizes_advanced', 'remove_image_size_95344');

So this x-la size will still show for images before the unset function was added.

To remove this you can try.

Hide it from the display using image_size_names_choose

function remove_image_size_95344($possible_sizes) {

 unset( $possible_sizes['x-la'] );
 return $possible_sizes;

}  
add_filter('image_size_names_choose', 'remove_image_size_95344');

Answer from https://wordpress.stackexchange.com/questions/95344/hide-custom-image-sizes-from-media-library#answer-95350

Answer 2

I tried intermediate_image_sizes_advanced and it wasn't working, so I inspected the get_intermediate_image_sizes() function and saw that they now use the intermediate_image_sizes filter hook.

So I was able to remove all image sizes by doing this.

add_filter('intermediate_image_sizes', function($size){
    return [];
},9999);

Fill free to create the callback function separately so it can be unhooked.