Upsampling adds more pixels/dots per inch (dpi), but creates blurry images, ugly blocks of color, and high contrast in images. The only way resolution can be improved is by decreasing the image size, or by recapturing the image at a higher quality setting.
Postcrossing is an online project that allows its members to send and receive postcards from all over the world.
Put simply, cross-domain tracking is the process of following a visitor as he navigates from one domain to another. It is the key to stitching the visitor's visit together across two or more domains so the web analyst for the site's company can perform accurate analysis. I'll get into more detail in the following sections.