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Improving Discrimination of Symbols for Display at Low Resolution

SUMMARY This research draws attention to the fact that the issues involved in rendering characters on screen at low resolution are as relevant to symbols or icons as they are to letterforms. The results of research aimed at improving the perceptibility of letterforms on screen are used to develop a set of modifications that can be applied to symbols that have been scanned from an original design on paper. These modifications are implemented in two stages: rule-based modifications, followed by individual pixel editing. The effectiveness of these modifications in improving the discriminability of symbols varying in graphic complexity is evaluated by a perceptual experiment which compares the unmodified versions with the two modified versions. Subjective judgements of each of the versions are also obtained. The results suggest that these modifications can improve the discrimination of symbols on screen. However, the graphic complexity of symbols affects the type and extent of modifications that can be made. This factor must therefore be considered in any development of automatic instructions for the rendering of symbols at low resolution.