Tablets have screen sizes from 7-inches to 20-inches and sell for $70 to over $1,200. They have PPI ranging from 132 to 339. Factoring that data for some of the more popular devices we produced a chart of the cost per megapixel. Which you can check out at JPR Blogs - Seeing more. The lowest cost tablet, the 7-inch Ematic ($75) got the best score.This chart and lots of other data will be in our forthcoming 2013 report, Mobile Devices and the GPUs in them.