The new standard for color FAX has been approved in the past year. Several aspects of this standard are discussed with attention to implications on flexibility, device independence, and color accuracy. The baseline standard for facsimile provides the means to transmit 24-bits/pixel color data in the CIE L*a*b* color space. The base resolution for this hard copy based system is 200 dpi. The data is coded using JPEG, and the lossy DCT-based mode is used. The degree of lossiness is not mandated by the standard, but chosen by the transmitter. The DCT coefficients are entropy coded using Huffman coding. Further details of the basic mode and options currently in the color fax standard are presented. Possible extensions of the standard to soft copy image transmission, alternate illuminants, lossless coding, and multicolor document coding are discussed.
Andrew H. Mutz, Daniel T. Lee, "An International Standard for Color Facsimile" in Proc. IS&T 2nd Color and Imaging Conf., 1994, pp 52 - 54, https://doi.org/10.2352/CIC.1994.2.1.art00014