Because in lithography the printing surface is completely flat,it is referred to as

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The term planographic is specifically used to describe printing methods where the printing surface is completely flat, such as lithography. This is distinct from intaglio printing, where the image is etched or engraved into the surface, and relief printing, where the image is raised above the surface. The terms negative and positive are more generally used to describe the tonal image of a photograph or print, and are not as directly relevant to the printing process itself.

Because in Lithography the Printing Surface Is Completely Flat,it Is