Robert F. Sproull
Ivan E. Sutherland
ABSTRACT
When compared with a drawing on paper, the pictures presented by today's computer display equipment are sadly lacking in resolution. Most modern display equipment uses 10 bit digital to analog converters, providing for display in a 1024 by 1024 square raster. The actual resolution available is usually somewhat less since adjacent spots or lines will overlap. Even large-screen displays have limited resolution, for although they give a bigger picture, they also draw wider lines so that the amount of material which can appear at one time is still limited. Users of larger paper drawings have become accustomed to having a great deal of material presented at once. The computer display scope alone cannot serve the many tasks which require relatively large drawings with fine details.
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