A model is reduced to a picture by systematic transformation through several coordinate systems. The user's coordinate system, commonly called world space is the highest level, while the device coordinate system and device space is the lowest. Image Space is the three-dimensional coordinate system that contains screen space. It is the space where the camera transformation directs its output.
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The term Image Space is used to define the 3-dimensional volume.
This volume contains Screen Space, which is the intersection of the plane with image space. Points in image space are mapped into screen space by projecting via a parallel projection, onto the plane - thus, for example, any point in image space will project to the center of the display screen.
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