WordPress Developer Resources

apply_filters( ‘jpeg_quality’, int $quality, string $context )

Filters the JPEG compression quality for backward-compatibility.

Description

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

The WP_Image_Editor::set_quality() method has priority over the filter.

The filter is evaluated under two contexts: ‘image_resize’, and ‘edit_image’, (when a JPEG image is saved to file).

Parameters

$qualityint: Quality level between 0 (low) and 100 (high) of the JPEG.
$contextstring: Context of the filter.

Source

$quality = apply_filters( 'jpeg_quality', $quality, 'image_resize' );

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Used by	Description
wp_save_image_file()`wp-admin/includes/image-edit.php`	Saves image to file.
WP_Image_Editor::set_quality()`wp-includes/class-wp-image-editor.php`	Sets Image Compression quality on a 1-100% scale.

Changelog

Version	Description
2.5.0	Introduced.

User Contributed Notes

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behzadg 8 years ago

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To change JPEG Compression, temporarily add the below code to functions.php then refresh the site to re-compress all thumbnails on the site.
```
function my_prefix_regenerate_thumbnail_quality() {
	return 80;

}

add_filter( 'jpeg_quality', 'my_prefix_regenerate_thumbnail_quality');
```
- “Refresh(ing) the site” is not going to recompress the images. For this you’ll need to regenerate all thumbnails and derived sizes using a plugin for this purpose.
  
  theMikeD 2 years ago
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Emil Uzelac 8 years ago

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Snippets should be included here, not hosted elsewhere.

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Rami Yushuvaev 9 years ago

You must log in to vote on the helpfulness of this noteVote results for this note: -10You must log in to vote on the helpfulness of this note

Changing the JPEG compression quality:

https://generatewp.com/snippet/xNM817E/

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