Using your example, the width and height of the above images will be at
here is that output of all values from an example gallery with one image
Array (  => Array ( [ID] => 389 [id] => 389 [title] => atomic-bomb-explosion [filename] => atomic-bomb-explosion.jpg [url] => .../wp-content/uploads/jpg/atomic-bomb-explosion.jpg [alt] => [author] => 1 [description] => [caption] => [name] => atomic-bomb-explosion-2 [date] => 2017-06-14 16:20:25 [modified] => 2017-06-14 16:20:25 [mime_type] => image/jpeg [type] => image [icon] => .../wp-includes/images/media/default.png [width] => 1400 [height] => 1050 [sizes] => Array ( [thumbnail] => .../wp-content/uploads/jpg/atomic-bomb-explosion-150x150.jpg [thumbnail-width] => 150 [thumbnail-height] => 150 [medium] => .../wp-content/uploads/jpg/atomic-bomb-explosion-300x225.jpg [medium-width] => 300 [medium-height] => 225 [medium_large] => .../wp-content/uploads/jpg/atomic-bomb-explosion-768x576.jpg [medium_large-width] => 474 [medium_large-height] => 356 [large] => .../wp-content/uploads/jpg/atomic-bomb-explosion-1024x768.jpg [large-width] => 474 [large-height] => 356 [post-thumbnail] => .../wp-content/uploads/jpg/atomic-bomb-explosion-672x372.jpg [post-thumbnail-width] => 672 [post-thumbnail-height] => 372 [twentyfourteen-full-width] => .../wp-content/uploads/jpg/atomic-bomb-explosion-1038x576.jpg [twentyfourteen-full-width-width] => 1038 [twentyfourteen-full-width-height] => 576 ) ) )
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