There are a variety of ways to achieve bumped and indented metal surfaces. Embossing is performed while the thin metal is still in coil or sheet form. Embossing imparts a texture by passing smooth, thin-gauge metal through engraving rolls, which press a pattern into the metal surface. Embossing stiffens the metal surface, reducing the “oil canning” tendencies of the thin sheet. The embossing rolls flatten the metal for further roll forming into corrugated panel shapes or for forming flat sheets into sheet metal configurations.