Patent ID: 6031517
Filing Date: 2000-02-29
Classification: G09G

Abstract:
A method for improving the legibility of text characters to be displayed in color on the screen of a display unit, comprising the steps of:a. receiving input signals specifying the text characters and respective intended colors thereof selected from a set of possible different colors;b. in a first state, providing output signals specifying the text characters and intended colors thereof; andc. in a second state:i. cross-mapping colors, so that at least one of the input signals is changed to specify a new color from the set by the step of assigning colors according to the following table: A B C D  1. white yellow cyan green 2. yellow cyan green white 3. cyan green white yellow 4. green white yellow cyan 5. magenta magenta magenta magenta 6. red red red 7. blue blue blue blue 8. black black black black  where the set of possible colors are those in each of the columns of said table and said assigning step includes the following steps:choosing a column from the table;identifying a plurality of types of characters within the text to be displayed; andtransforming the colors of the characters according to the frequency of the respective types to which the characters belong, so that rows of the chosen column correspond to respective types of characters in decreasing order of frequency, andPA