I have been using your plugin to optimize my images. My theme automatically makes my thumbnails 240 px x 180 px, but they were not very clear, so I changed it to the original image quality of 600 px v 450 px. The thumbnails look a lot better but they are the same file size as the original image, so looking to reduce. On GTMetrix I am getting an F on serving scaled images. Does your plugin handle scaling images or do I need something else? I've read scaling shouldn't affect the quality. Thanks.