Ever notice how WordPress smushes your JPG images down to 60% quality after your upload them?  Add the snippet below to your theme’s functions.php or alternatively, download this plugin to improve the quality of your JPG images to 100%.  Please note: You will sacrifice speed for quality.

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

add_filter('jpeg_quality', 'gpp_jpeg_quality_callback');