Final answer:
In planar printmaking, the ink is at the level of the original surface, and in intaglio printmaking, the ink is below the original surface. Planar techniques include lithography and monoprinting, while intaglio encompasses etching and engraving.
Step-by-step explanation:
In planar printmaking the ink is at the level of the original surface, while in intaglio printmaking the ink is held below the original surface. Planar printmaking techniques, like lithography and monoprinting, involve inking the surface of a matrix, which can be metal, stone, or plexiglass, and then using various methods to remove ink where the image is not desired. Relief printmaking involves cutting away the non-image areas of the matrix so that the ink resides on the original surface level, creating a raised effect. Intaglio printmaking, including etching and engravings, involves incising the image into the matrix so that the ink fills these below-surface incisions, and the surface is then wiped clean before pressing onto paper.