Article

Standards for Digitization in Cases of Maps, Documents, and other Relics in the Service of Cultural Heritage

Table 2

Types of quality calculation(for digitized text)

Black and white text
QI = (dpi*0.039*h)/3 
h = (3*QI) /(0.039*dpi)
dpi = (3*QI)/(0.039*h)
Text in shades of gray or color
QI = (dpi*0.039*h)/2
h = (2*QI) /(0.039*dpi)
dpi = (2*QI)/(0.039*h)

Levels of Image Quality
(8.0) Excellent
(5.0) Good
(3.6) Poor
(3.0) Just Readable