In my child Theme I have set my custom image with add_image_size( 'big', 1500, 1000 ) I left out the crop parameter, but it is [false by default][1] anyway.

I want to make this a variable option.

I have just written a plugin that displays all the registered image sizes (including WP's thumbnail, medium and large sizes) plus my custom size.

With checkboxes I do update_option($_size."_crop", true) for WP's image sizes and global $_wp_additional_image_sizes; $_wp_additional_image_sizes[$_size]['crop'] = true for my custom size.

The thumbnail, medium and large work all fine but I can't get to override the default false $crop parameter from add_image_size? When I var_dump($_wp_additional_image_sizes;) on my plugin page the boolean displays true, but when I upload a new image it is like add_image_size() wins over my plugin?

When I set add_image_size( 'big', 1500, 1000, true) in functions.php everything works like I want, but I want to make it an option to switch between hard and soft cropping - from my plugin options page obviously.

1 Answer 1


OK I have found out a way to do this. With the plugin, with some checkboxes I am setting a crop option in the db in wp_options table, just like WP does it for the thumbnail, medium and large sizes.

So my big image sets the add_option('big_crop', true)

Than in functions.php I do:

if ( get_option( "big_crop" ) == true ) {
    add_image_size( 'big', 1500, 1000, true );  
} else {
    add_image_size( 'big', 1500, 1000, false ); 

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