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How to use big_image_size_threshold filter in WordPress

Sandeep Kumar Mishra
Sandeep Kumar Mishra
April 26, 2023
5 minutes read

big_image_size_threshold filter

If the original image width or height is above the threshold, it will be scaled down. The threshold is used as max width and max height. The scaled-down image will be used as the largest available size, including the _wp_attached_file post meta value.

To use the big_image_size_threshold filter, first, you have to register it using add_filter. You can write this code into the functions.php of your activated theme or in a custom WordPress Plugin. We at WePlugins always prefer to create a custom WordPress Plugin while using hooks so nothing breaks when you update your WordPress Theme in the future.

In the below live example, we have defined a function modify_big_image_size_threshold_defaults which takes 4 parameters, and we registered it using add_filter. The first parameter big_image_size_threshold is the name of the hook, the second parameter modify_big_image_size_threshold_defaults is the name of the function that needs to be called, the third parameter is the priority of calling the hook if the same hook is used multiple times and the last parameter is the number of arguments (if any) to be passed in the registered function.

Sometimes, you have to remove a registered hook, so you can use remove_filter to remove big_image_size_threshold filter.

Parameters

  • $threshold: (int) The threshold value in pixels. Default 2560.
  • $imagesize: (array) Indexed array of the image width and height in pixels.
  • $file: (string) Full path to the uploaded image file.
  • $attachment_id: (int) Attachment post ID.

Example 1: Completely Disable Image Size Threshold

This example demonstrates how you can completely disable the image size threshold using the hook.

    add_filter('big_image_size_threshold', '__return_false');
  

Example 2: Increase Image Size Threshold

This example shows how to increase the image size threshold to 4000px.

    function weplugins_big_image_size_threshold($threshold) {
        return 4000; // new threshold
    }
    add_filter('big_image_size_threshold', 'weplugins_big_image_size_threshold', 999, 1);
  

Example 3: Modify Image Size Threshold Conditionally

Below is an example showing how you can use this hook to modify the threshold conditionally.

    function weplugins_modify_big_image_size_threshold_defaults($threshold, $imagesize, $file, $attachment_id) {
        // Update the $threshold variable according to your website requirements and return this variable.
        return $threshold;
    }
    // add the filter
    add_filter('big_image_size_threshold', 'weplugins_modify_big_image_size_threshold_defaults', 10, 4);
  

To remove a hook callback, use the example below.

    remove_filter('big_image_size_threshold', 'weplugins_modify_big_image_size_threshold_defaults', 10, 4);
  

Ensure you provide the same callback function name, priority, and number of arguments while removing the hook callback.

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If you’re having any trouble using this hook or need customization, please Contact Us. We’d be happy to assist you!

Sandeep Kumar Mishra

Sandeep Kumar Mishra

Sandeep Kumar Mishra writes about WordPress and Artificial Intelligence, offering tips and guides to help you master your website and stay updated with the latest tech trends.

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