Title: Post thumbnails quality
Last modified: February 20, 2018

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# Post thumbnails quality

 *  Resolved [max143](https://wordpress.org/support/users/max143/)
 * (@max143)
 * [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/)
 * I want have 100% image quality in thumbnails. I added in functions.php this code`
   add_filter('jpeg_quality', function($arg){return 100;});` But it does not work.
   Images before and after have the dame quality and size(kb).
    Also thumbnails 
   were regenerated.
    -  This topic was modified 8 years, 2 months ago by [max143](https://wordpress.org/support/users/max143/).

Viewing 4 replies - 1 through 4 (of 4 total)

 *  [ProjectArmy](https://wordpress.org/support/users/supporthero/)
 * (@supporthero)
 * [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/#post-9996279)
 * It doesn’t disable compression in reality, it sets the quality to 100 which means
   it still performs compression. With jpegs, the more you use them the more quality
   they lose over time. They lose quality every time they go through optimization
   or saving ([source](https://photo.stackexchange.com/questions/56304/does-simply-opening-and-closing-a-jpeg-file-decrease-image-quality)).
   If you open jpeg in Photoshop, and save it without any edits, it will lose quality.
   With WordPress compression it’s the same. Every time you regenerate images in
   WP, they lose quality. It’s just the way jpegs are made.
 * Uploading images via FTP would be the best option to preserve quality.
 *  Thread Starter [max143](https://wordpress.org/support/users/max143/)
 * (@max143)
 * [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/#post-9998717)
 * Thanks for answer. And if I use PNG, will it lose quality same as JPG?
 *  Moderator [bcworkz](https://wordpress.org/support/users/bcworkz/)
 * (@bcworkz)
 * [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/#post-10000179)
 * Not the same as, but you will lose quality all the same. The compression methods
   are different so the results are different. Both use lossy compression though,
   so repeatedly re-compressing will degrade images either way.
 * Even given the same compression method, the quality of the compressing algorithm
   varies by application. The compressor in GD, the usual image processor used by
   WP, is not very good IMO. As ProjectArmy suggests, using alternative, quality
   resizing applications such as Photoshop to get to the size you need and uploading
   via FTP is the best way to preserve quality.
 *  Thread Starter [max143](https://wordpress.org/support/users/max143/)
 * (@max143)
 * [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/#post-10004961)
 * Ok, thank You

Viewing 4 replies - 1 through 4 (of 4 total)

The topic ‘Post thumbnails quality’ is closed to new replies.

 * In: [Developing with WordPress](https://wordpress.org/support/forum/wp-advanced/)
 * 4 replies
 * 3 participants
 * Last reply from: [max143](https://wordpress.org/support/users/max143/)
 * Last activity: [8 years, 2 months ago](https://wordpress.org/support/topic/post-thumbnails-quality/#post-10004961)
 * Status: resolved

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