This research elucidates the appropriate method for evaluating Thai Character reproduced from electrophotographic printer and inkjet priner. Subjective and objective evaluation methods are compared. CU Tomlight font is used for the test form. The selected Thai characters are printed by imagesetter at 1200 dpi on photographic paper. The same test forms are obtained from the electrophotographic printers at 300, 600 and 1200 dpi. and the inkjet printers at 360, 720 and 1440 dpi on 80 g/cm2 uncoated paper. The objective evaluation attributes are density, line character width, edge raggedness and head of Thai character measured by microdensitometer. The character sets are 10, 16 and 20 points of ถ, ข, ด and พ. The subjective evaluation criteriors are character body gaining, fill-in head and legibility. The observers are 20 persons working in prepress area. The selected character sets are ก ฎ ฏ ถ - ข ฃ - ค ฅ ด ศ - ษ - ฝ พ ม - ฉ จ ฐ ธ ท ย ส at 8, 10, 12, 16, 18, 20 and 24 points. The t-distribution technique is used to compared the quality of Thai character printed from electrophotographic printers and inkjet printers. The results indicate that the density of the characters printed by all machines are similar except those printed from inkjet at 300 dpi is lower. The line characters width and the shape of the character head printed from electrophotographic printers are closed to the original, designed by Fontographer, than those printed from inkjet printers. This conclusion agrees with the subjective evaluation.
