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Proceedings Paper

Resolution and bit depth: how much is enough?
Author(s): R. Victor Klassen; Kalpana Janamanchi
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Paper Abstract

We describe results of experiments studying the tradeoff between resolution and bit depth. Images in the experiments were printed on a high resolution imagesetter, eliminating most, if not all, device effects. They were first converted from PostScript to antialiased rasters at one of a set of resolutions, then converted from 8 bit to n bits for some value of n less than 8. Before printing, they were converted back to 8 bits and scaled up to printer resolution, then halftoned for printing. We were measuring human response to a system that had a bandwidth bottleneck somewhere upstream of the printer, and sophisticated resampling and halftoning at the printer itself. The images, typical of those used for critical evaluation of hard copy, contained text, analytical test targets, synthetic graphics and pictorial images. We found bit depths and resolutions beyond which no further improvement was observed, typically somewhat higher limits than previously believed. We also compared methods of font hinting for antialiased text, and found that font hinting improves text only at one bit per pixel, degrading it at higher bit depths.

Paper Details

Date Published: 2 June 2000
PDF: 9 pages
Proc. SPIE 3959, Human Vision and Electronic Imaging V, (2 June 2000); doi: 10.1117/12.387165
Show Author Affiliations
R. Victor Klassen, Xerox Corp. (United States)
Kalpana Janamanchi, Xerox Corp. (United States)

Published in SPIE Proceedings Vol. 3959:
Human Vision and Electronic Imaging V
Bernice E. Rogowitz; Thrasyvoulos N. Pappas, Editor(s)

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