Set default image sizes in WordPress to hard crop

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How do I set the medium and large images sizes in WP to hard crop?

In my theme I can set the thumbnail size to hard crop using this:

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add_theme_support('post-thumbnails');
set_post_thumbnail_size( 96, 96, true );

But I can see no way to make the medium and large images to hard crop.

Is there possibly a way to remove the medium and large sizes and re-add them using: 

add_image_size( 'medium', $width, $height, true );
add_image_size( 'large', $width, $height, true );
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4 comments

  2. Here’s an improvement that uses the settings as you tried to do:

    add_image_size('medium', get_option( 'medium_size_w' ), get_option( 'medium_size_h' ), true );

  3. To enable cropping for the medium images, it is enough to use this code:

    update_option( 'medium_crop', 1 );

    The update_option() function itself checks whether such an option exists, and adds it if necessary:

    If the option does not exist, then the option will be added with the option value, with an $autoload value of yes.

  4. The Gleb’s answer worked nicely for me.

    // Medium Size Thumbnail
if(false === get_option('medium_crop')) {
    add_option('medium_crop', '1'); 
} else {
    update_option('medium_crop', '1');
}

    Found the full code here