Change the Default WordPress Thumbnail JPG Compression Quality

A question I too was asking myself only recently but didn’t have the time to look at, but thankfully, Orman then posted a link to a solution:

I’ll archive the code here as the link is using Google’s cache as the site isn’t currently working.

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

Just add the single line above to your functions.php file if you’re using PHP5+, otherwise you’ll have to use the code below. Change 100 to the percentage quality you want the thumbnails to be saved out to.

function jpeg_quality_callback($arg)
{
return (int)100;
}

add_filter('jpeg_quality', 'jpeg_quality_callback');

I haven’t tested this yet but a number of people in the comments of that post confirms it works.

Source: http://webcache.googleusercontent.com/search?q=cache:HoEuBeGE9REJ:www.skidoosh.co.uk/php/wordpress-jpeg-thumbnail-image-quality-setting-and-adjustment/

by @tkenny

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