Halftone dot gain in liquid electrostatic printing systems

James R. Larson

doi:10.1117/12.2322239

1 May 1992 Halftone dot gain in liquid electrostatic printing systems

James R. Larson

Proceedings Volume 1670, Color Hard Copy and Graphic Arts; (1992) https://doi.org/10.1117/12.2322239
Event: SPIE/IS&T 1992 Symposium on Electronic Imaging: Science and Technology, 1992, San Jose, CA, United States

Abstract

The development of an electrostatic printing system that is intended to emulate conventional printing must not only reproduce the color of the ink and the optical density of the printed solid area it must also obtain midtone dot gains and dot gain curves essentially identical to those obtained with conventional printing. In electrostatic printing halftone dot size may be affected by image charge decay which is accelerated in small features, enhanced toner development along edges due to electrostatic fringe fields, and by the transfer of the image to paper. This report will show how these phenomena are dependent on the size of the halftone dots and how they combine to impact dot gain in a liquid electrostatic printing system. Specifically, it is demonstrated that differences observed in midtone dot gains on prints obtained with two different electrostatic masters are primarily the result of toner transfer from the masters to paper, while differences observed in the shape of the dot gain curves on prints obtained from the two masters are primarily due to the charge decay and toner development characteristics for halftone dots of the two masters.

Citation Download Citation

James R. Larson "Halftone dot gain in liquid electrostatic printing systems", Proc. SPIE 1670, Color Hard Copy and Graphic Arts, (1 May 1992); https://doi.org/10.1117/12.2322239

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