There is 3rd party software from Blueharvest to remove these hidden files for about $13. Some digital picture frames will show these files in the thumbnail menu views as 'unsupported'.
DS_Store and resource files that have the same name as your photos but have a '. One of the issues is the Mac OS puts hidden files on the card such as. I'm looking for a digital picture frame also but I'm finding most have issues with the photos I put on a Compactflash card (the type of card my Father's camera uses).