Raised-Line Drawing

A raised-line drawing is a tactile representation of a visual image created by producing elevated lines on a surface that can be felt by touch, enabling blind and visually impaired people to perceive graphical information through their fingertips. Raised-line drawings can be produced using several methods including Braille embossers that create patterns of raised dots, swell paper (microcapsule paper) that raises printed areas when heated, thermoform machines that vacuum-form plastic sheets over moulds, and specialised tactile printers. Research in tactile graphics has shown that emphasising important object boundaries while reducing fine detail produces more comprehensible raised-line images, as the tactile sense has significantly lower resolution than vision and excessive detail can be overwhelming rather than informative.