Any illustration material that contains no halftone, continuous tone, or tinted images.
In digital and/or electronic imaging, line art is defined as illustration matter that can be displayed by pixels described by only one bit of information—i.e., black or white, on or off (or blue and white, white and gray, etc., depending upon the color palette being utilized). Digital line art is frequently created and output using vector-based graphics rather than bit maps. A drawing which exists as line art (rather than a painting, water color, etc.) is known as a line drawing.