How to use jpeg_quality filter in WordPress

jpeg_quality filter

Applies only during initial editor instantiation, or when set_quality() is run manually without the $quality argument.

To use jpeg_quality filter, first you have to register it using add_filter. You can write this code into 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_jpeg_quality_defaults which takes 2 parameters and we registered using add_filter. The first parameter jpeg_quality is name of the hook, The second parameter modify_jpeg_quality_defaults is name of the function which need to be called, third parameter is the priority of calling the hook if 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 jpeg_quality filter.

Parameters

Below are the 2 parameters required to use this hook.

• $quality: (int) Quality level between 0 (low) and 100 (high) of the JPEG.
• $context: (string) Context of the filter.

Live Example

Example 1: Basic Quality Adjustment

This example shows how to set the JPEG quality to 80.

    function weplugins_set_jpeg_quality() {
        return 80;
    }
    add_filter('jpeg_quality', 'weplugins_set_jpeg_quality');
    

Example 2: Conditional Quality Adjustment

In this example, we adjust the quality based on different contexts.

    function weplugins_modify_jpeg_quality($quality, $context) {
        if ($context === 'edit_image') {
            return 90;
        } elseif ($context === 'save_image') {
            return 70;
        }
        return $quality;
    }
    add_filter('jpeg_quality', 'weplugins_modify_jpeg_quality', 10, 2);
    

Example 3: Removing the Hook

To remove a hook callback, use the example below.

    remove_filter('jpeg_quality', 'weplugins_modify_jpeg_quality', 10, 2);
    

Please make sure to provide the same callback function name, priority, and number of arguments while removing the hook callback.

Contact Us

If you’re having any trouble using this hook, please contact our WordPress Development Team and we’d be happy to assist you.