Patent ID: 6580434
Filing Date: 2003-06-17
Classification: G06T,H04N

Abstract:
A computer-readable medium having computer-executable instructions for selecting a color to render at a position to represent a true color, the true color defined by color components having color component values, the color selected from a list having an upper portion and a lower portion, the computer-executable instructions performing the steps of:comparing a maximum color component value to a threshold value, the maximum color component value being a maximum of the color component values; and if the maximum color component value is at most the threshold value, determining the color to render at the position from the lower portion of the list, the step of determining the color comprising: selecting a halftone value from a halftone matrix; subtracting the halftone value from a color value to form a first halftone value; dividing the first halftone value by a pre-selected value to form a divided halftone value; comparing each of the color component values to the divided halftone value; and for each color component: adjusting a palette index by a predetermined amount if the color component value is greater than the divided halftone value.