Compaq Computer Corporation, Inc.

Gregory K Adams

Ralph K Williamson

A continuous-tone printer includes print enhancement circuitry for producing smooth edges responsive to continuous-tone pixel data. Translation circuitry translates the continuous-tone data into single-tone data responsive to a predetermined threshold. The single-tone data is stored in a memory coupled to edge enhancement circuitry, which may be similar to that used in prior enhancement circuits. For a given pixel, either the enhanced pixel data from the edge enhancement circuit or the continuous-tone data may be passed to print edges, based on the value of the continuous-tone pixel relative to upper and lower quantization values.

Continuous-tone printer with edge enhancement

Circuitry for controlling the margin of a laser printer is provided which times a preset margin on a first scanline of a page at high frequency for high accuracy. Thereafter, subsequent scanlines on the page are positioned responsive to the count generated responsive to the preset margin. Hence, the laser may be directly modulated at speeds higher than the standard frequency without a reduction in the relative accuracy of the margin.

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Tomball, TX, United States of America

Gregory K Adams