This book describes two ISO standardization projects - the Computer Graphics Interface (CGI) and the Computer Graphics Metafile (CGM). It has been written principally for users and practitioners of computer graphics. In particular, system designers, independent software vendors, graphics system implementors, and application program developers need to understand the basic standards being put into place at the so-called Virtual Device Interface. Technical managers, graduate students in computer science specializing in graphics, and buyers in government and industry will also find this book valuable. The CGI project is standardizing a functional and syntactic specification for the exchange of device-independent data and associated control information between systems with graphical capabilities. The CGI defines idealized abstract classes of graphical devices capable of accepting input and generating, storing and manipulating pictures. The CGM provides a file format suitable for the storage and retrieval of device-independent picture descriptions. Pictures described by a sequence of CGI function invocations can be written to disk and stored compactly as CGMs, and CGMs can be interpreted and displayed efficiently using a CGI implementation. Formal standards documents are difficult to read. They are dry, complex and lack tutorial material. This book is intended to supplement the standards documents themselves. Organized into four parts comprising seventeen chapters, it includes many illustrations and examples not found in the standards. The book also explains the relationship of the CGI and CGM to other standards, both formal and de facto, describes some early commercial implementations of the standards, and gives the reader insight into the future evolution of these standards.
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4.0 out of 5 stars
One and probably only summary of CGI and CGM,
By ThomasH (Santa Clara, CA USA) - See all my reviews
This review is from: CGM and CGI: Metafile and Interface Standards for Computer Graphics (Symbolic Computation Computer Graphics-Systems and Applications) (Hardcover)
Computer Graphics Interface (CGI) and Computer Graphics Metadata (CGM) were invented a while ago, take it: a long while ago!. But much of the industrial large graphical databases still use these protocols as their base of information. If you work with such data, e.g. for NC production, this book contains the most valuable information for the practice. These days CGI means mostly "Computer Generated Imaging" or another use in networks: Common Gateway Interface. This CGI in this book might be mostly a thing of a past, replaced by DirectX or OpenGL, but CGM still lives, foremost in the very much actively used WebCGM. WebCGM 2.1 was approved in year 2008. The web page of the consortium is cgmopen org. Take this book if you need information about the primary CGM standard for compatibility and proper interpretation. Aside of this contextual aspect, Arnold and Bono are good writers and explain well the spirit of both standards.
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