Ever wonder what the difference is between an engraving and an etching? Graphics Atlas, a project of the Image Permanence Institute, will show you. With this tool, users can compare different printing techniques side by side and learn about the methods used for each technique. In addition, the site features fantastic visual tools such as the ability to zoom in and out, flip the page over, see a side view, and change the light source. The mediums discussed range from pre-photogenic (etchings, mezzotints) to digital.