When creating artwork for foil blocking (or spot UV), we recommend using vector software such as, Adobe Illustrator to create vector art. Vector software uses mathematic equations and geometric primitives (points, lines and shapes) instead of pixels which form raster based images that are based on resolution. Because of this, vector art can be scaled infinitely, without any loss of quality of fidelity, whereas raster (pixel) images become more blurry and pixelated the more they are enlarged. Vector artwork is ideal to manufacture the metal dies/blocks required for foil stamping. Etching foil dies from pixel based files can result in jagged edges and poor quality prints. If you are unable to supply vector files, then we can use raster images providing the resolution is no less than 1200dpi and has sharp clean edges when view at 100%. We still prefer vector files to ensure the quality of our work, but we can accept these as a backup.