Test images have played an important role throughout the development of Group 3 and Group 4 facsimile. This Recommendation has been prepared with the goal of providing a standard set of images1 to facsimile experimenters. The set includes images that have been used over the years plus new images that are applicable for gray scale and color. The standard set of images will provide a consistent baseline for further work; for example, results of compression algorithm experiments and image quality tests can be compared by a broad range of users, knowing that the input image data is identical. The set of images, stored on a Compact Disk Read Only Memory (CD-ROM), is available from the ITU.