What is Digital Images ?

Whatis methods of digital printing ? wikipedia have aanswer for that. This the answer :

Fineart inkjet printing

Largeformat inkjet printers have been developed over the last two decades that usedye based inks or archival, lightfast pigment based inks that can be applied toa variety of traditional media including smooth or highly textured watercolorpaper, prepared canvass, and various textiles. This has allowed for thecreation of accurate series reproductions of 2 dimensional artworks. It alsoallows for the output of digital art of all types as finished pieces or as anelement in a further art piece. This type of digital printing is commonly knownas Giclee, Digigraph, and other coined or trade names.

Digitallaser exposure onto traditional photographic paper

Digitalimages are exposed onto true, light sensitive photographic paper with lasersand processed in photographic developers and fixers. These prints are truephotographs and have continuous tone in the image detail. The archival qualityof the print is as high as the manufacturer's rating for any given photo paperused. In large format prints, the greatest advantage is that, since no lens isused, there is no vignetting or detail distortion in the corners of the image.

Digitalprinting technology has grown significantly over the past few years with substantialdevelopments in quality and sheet sizes. The three main digital printingpresses are the HP Indigo, Xerox iGen and Kodak Nexpress all have their pointsof differences and advantages.