PHIGS (Programmer’s Hierarchical Interactive Graphics Standard)
PHIGS is the second standard developed in, computer graphics for the development of computer systems and software, it is known as an advancement to the previous standard because it supports more increased capabilities for the modeling of objects, better picture manipulation and other color specification guides.
Just like the GKS, PHIGS also comes with its extension which is named PHIGS+ which was developed to provide the 3-dimensional surface shading capabilities which was not available in the PHIGS.
Graphics Software Standards in Computer Graphics
Graphics software standards help to create and set a standard for the development of computer graphics, as there are mainly two categories or general classes of computer graphics: General programming packages and Special-purpose applications packages.