jpeg_quality │ filter-hook │ WP 2.5.0

Sets the compression quality of generated JPG files.

By default, WordPress creates files with 82% compression quality. This filter allows the value to be decreased or increased.

In most cases, there is no need to change this parameter. However, to save a few kilobytes, setting the quality to 80 or 70 may be useful.

Usage

add_filter( 'jpeg_quality', 'wp_kama_jpeg_quality_filter', 10, 2 );

/**
 * Function for `jpeg_quality` filter-hook.
 * 
 * @param int    $quality Quality level between 0 (low) and 100 (high) of the JPEG.
 * @param string $context Context of the filter.
 *
 * @return int
 */
function wp_kama_jpeg_quality_filter( $quality, $context ){
	// filter...
	return $quality;
}

$quality(integer)

The compression quality. It can range from 0 (maximum compression) to 100 (no compression).

Examples

#1 Usage example

Suppose you are a photographer who runs a blog. The quality of published photos is reduced, but WordPress must process the images without reducing their quality, meaning 100% quality is required.

Use this hook by adding the following code to the theme's functions.php file:

add_filter( 'jpeg_quality', 'filter_function_name_11' );
function filter_function_name_11( $quality ){
	return 90;
}

It can be written more concisely (for PHP versions above 5.3):

add_filter( 'jpeg_quality', function( $quality ){
	return 100;
} );

#2 PHP 7.4 version

add_filter( 'jpeg_quality', fn ( $q ) => 100 );