The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 20, 1994
Filed:
Oct. 07, 1993
Douglas L Franz, Vancouver, WA (US);
Hewlett-Packard Company, Palo Alto, CA (US);
Abstract
The method approximates full color resolution by combining dot-on-dot (DOD) and dot-next-to-dot (DND) techniques in printing images received from a computer. The method prints with DOD at the edge of an image or in a depleted area within an image and prints with DND elsewhere within the image to conserve printing time and ink. In the method, the color for each dot of the image is stored, and the image is divided into subgroups of four dots each. Each dot is then tested for significance by looking at whether other dots within the group or adjacent to the group are white. The color for each dot is mapped to one or more colors for printing, the mapping depending on the significance status of at least one dot within the subgroup. In this manner the image is checked for solid and depleted areas of color so that the minimum number of dots are printed within each subgroup.