I just noticed that large, bold, text or sold blocks of colour in jpg images, seem to develop artifacts once I upload them to my site. They look fine on my computer and on facebook but look weird on my site. Please check the links below to better understand my issue.
Look closely at the letters FTOM on this page: http://agletdesign.com/ftom-june-2012/
Here it looks fine on fb: https://www.facebook.com/agletdesign
All the jpgs I upload are resized perfectly for my theme before I upload them, so why is this happening?