High quality color picture painting system may be one of the most interesting problems for various application fields such as infant education, natural color picture animation synthesis, and hobby works. Picture signal can be divided into luminance data and chrominance data. Luminance data is scalar and chrominance data is vector. And then, in those signals, the parts of discontinuity is considered as outlines of the picture. In order to process high quality color pictures it is necessary to consider the properties of outline and region as features of the picture. Thus, we need the system design that uses point, line, and region features for frame structure and manipulates luminance and chrominance data as attribute values. Also, we must consider duality of picture processing and painting. Moreover, for software productivity, reliability, and extensibility, it is wrong to implement directly by using general language such as C. In the process of software production, we want to emphasize the needs of the Application Specific Language. The Window-based Elaboration Language for Picture Processing and Painting (WELL-PPP) is developed as an example of the Application Specific Language. In the developing process, WELL-PPP plays an important role for actual implementation of software process that includes defining a set of data, operations and windows, and many objects. WELL-PPP also defines the executing process of operations. Exchange of data between windows is managed by standard protocol of WELL-PPP. WELL- PPP has a close relation with the TELL system. This paper describes the processes of software production and color picture processing and painting. This software process is suitable for collaborated works.