Have you noticed that when JPG images get resized they can become a little fuzzy? Sharpen Resized Images is a plugin that will sharpen the images you upload to WordPress as they are resized. Take a look at the difference:
Sharpen Resized Images has no settings – just install and activate. Please note that it will not affect images that have already been uploaded. It will only affect new uploads after you’ve enabled it. Download Sharpen Resized Images for free from the WordPress plugin repository.