The images in this Recommendation include the original eight "ITU-T images" (referred to for years as the "CCITT images"), two bi-level test charts, a gray-scale test chart, various screened half-tone images, electronically dithered images, computer-gener
ITU-T T.24-1998 history
2015ITU-T T.24-2015 Standardized digitized image set (Study Group 16)
1998ITU-T T.24-1998 Standardized Digitized Image Set - Series T: Terminals for Telematic Services Study Group 8; 64 pp