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.
This section is about the educational aspects of the Postcrossing project. Discuss the uses of Postcrossing in education. Share lesson plans, receive help and exchange experience and tips on how you as an educator are using postcrossing. Talk about what works and doesn't work in the classroom.