For a number of years image processing and computer graphics have been treated as separate subjects. Conferences and journals exist for one group or the other but rarely for both groups. However, the hardware for computer graphics and even for alphanumeric displays more and more frequently uses raster-scan techniques, and such displays are equally suitable for image processing. Likewise, image-processing equipment can be used for drawing vectors and writing text as well as for outputting images. Recently, therefore, there has been interest in combining interactive graphics techniques and image processing techniques on the same display screen. This paper explores "image-mixing" techniques and their use in graphics and the corresponding use of graphics in image processing. Several examples are discussed. © 1979.