I work a lot with line art, particularly calligraphy. The work is based around the use of 2-bit color, also known as bitmap mode (in Photoshop). This is required for a range of specialty printing, engraving, embossing, etc. Printers in these specialties WILL NOT ACCEPT art in any other form, except occasionally vector art. Conversion from hand-calligraphy or drawing on paper to vector art is very complicated, and depends on an intermediary step of bitmap conversion. Please include a bitmap mode to your color modes. Thank you.