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Fast Heuristic for Converting Grey Scale Characters to 2x Binary

IP.com Disclosure Number: IPCOM000064282D
Original Publication Date: 1985-Jun-01
Included in the Prior Art Database: 2005-Feb-18

Publishing Venue

IBM

Related People

Authors:
Bantz, DF [+details]

Abstract

The special case of converting a 4-level grey scale character matrix to its binary equivalent at twice the resolution is important, because the pel (picture element) density of many microcomputer displays is approximately half that of a printer in high-resolution mode. Of course, if grey scale characters are to be displayed, then they must be printable also. One alternative is to keep two character matrices: one is the grey scale original, and the other the binary equivalent. This alternative requires twice the storage required for the grey scale characters only. The ability to convert to binary when needed means that any changes to the grey scale matrix automatically are reflected in the printed version. Display performance requirements are more stringent than printer response time.