Vector art is always preferred. Fully vectorized files should be created in Adobe Illustrator, or Corel Draw and saved in Adobe Illustrator *.ai or *.eps formats. Any tints (shades of color/gray) must range between 30% and 70%. Graduated tints must be comprised of one color only and fall into the above mentioned range.
All fonts contained in these file types should be converted to outlines (lines & curves). The above mentioned formats will not be accepted with embedded or placed raster images.