Adobe, Inc.

William H Paxton

Stephen N Schiller

Michael D Schuster

John E Warnock

An improved method for displaying a character on a raster device at relatively low resolution by identifying regions of the character that improperly touch other regions of the character, and then modifying the display of that character to move or delete pixels which decrease legibility of the character, by (1) enumerating the pixels in an order determined by the path topology, (2) searching for sequences of pixels corresponding to a pointed feature in the character that undesirably touches other parts of the character, and (3) editing the bitmap to remove such contacts.

Method for editing character bitmaps at small sizes

Method for displaying characters with improved legibility at relatively low resolution by modifying the center point fill method and displaying additional pixels as needed to maintain connectivity and avoid dropout problems. Additional pixels are turned on as needed where a black section of the character crosses the midline between two adjacent horizontal or vertical pixel centers. If the intersections of a black section of a character with a midline is entirely within one pixel which is not otherwise turned on, then that pixel is turned on; if a black section of a character crosses between two such adjacent pixel reference points in parts of both pixels, and if neither pixel is already on, the pixel having more of the black section, measured along the line between pixel centers, (or other reference points), is turned on.

Dropout-free center point fill method for displaying characters

A method for displaying characters on a screen or printer, particularly kanji characters. The structure of the character is represented by stems and counters, both vertical and horizontal, the counters being the spaces between stems. The character is then adjusted to be displayed. Either the horizontal or vertical counters are grouped into a first chain of counters. The non-integral counter widths of this chain are adjusted in relation to the other counter widths within the chain, selected counter widths being made equal to others within the chain in order to most faithfuly reproduce the desired character. The remaining horizontal or vertical counters, if any, are also grouped into one or more series of chains which are also adjusted, chain by chain. Then the other set of counters are adjusted in the same way.

Method for displaying kanji characters

The invention provides a method for selecting the intensity level of each of the primary colors for displaying or printing a predetermined, desired color to be composed of a specified percent of each of the primary colors. Each primary color has available a predetermined number of discrete intensity levels ranging from minimum to maximum and is to be displayed on a matrix having a predetermined number of cells. The first step in the method is to determine a desired intensity level for each primary color and to select the number of cells of the matrix which are to display that color at that intensity level. These cells of each primary color are then arranged in the matrix in a predetermined ordering to display the desired color. The sequence of the ordering is predetermined and the same for each primary color. The starting point of the sequence of one of the primary colors is fixed, but the starting point for each successive primary color is dependent upon the ending cell location of the sequence of cells for the preceeding color. Using the invention, the amount of color memory required is reduced because the number of storage cells required for storage of color selection information need only be equal to the product of the numbers of available intensity levels for each primary color.

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Los Altos Hills, CA, United States of America

William H Paxton