In iTunes, I have asked photos from certain folders on my computer to sync with my iPhone (a Verizon Wireless iPhone 4). The folders are in chronological order. All of the photos through November 2010 sync. None of the photos from December 2010 and January 2011 sync. Some of the photos from February 2011 sync. A dialog box pops up in iTunes, which says that certain photos did not sync, because they can not be displayed on my phone. All of the pictures were taken with the same digital camera at the same resolution, all of the files are JPEGs, and all of the files are comparable in size. Any idea why some of them won't sync to my phone?