LaboImage provides scientists with general purpose as well as specific processing families and tools in a highly interactive environment. The current software results from an evolution reflecting several years of development and experiences. This paper first presents the new X Window / OSF Motif version of LaboImage, as it is seen by the user. It also describes how an image is manipulated in the system, how processing methods are applied and results are visualized. Multiple types of interaction between the user and the system are addressed. The implementation aspects are then detailed. They concern data structures as well as algorithms and interfaces. The data file and descriptor file formate used for strong images is described. The organization in memory of multiple data such as images, vectors, and macros is presented. The source code organization is also discussed. A clear separation between algorithmic and interface parts in the code appears to be very important, in order to allow easy further developments of the system.