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:
May. 18, 2004
Filed:
Oct. 25, 2001
James W Barmettler, Corvallis, OR (US);
Hewlett-Packard Development Company, L.P., Houston, TX (US);
Abstract
An alpha channel layer is generated by an opacity value that is assigned to each pixel of the image layer. The opacity value is represented by N bits/pixel and is generated by the expression j/(2 −1) where j is a value that represents the binary value of the N bits. When the image is to be rendered on the new background, the background layer is combined with the image and alpha channel layers to generate the updated, final RGB values for each pixel. These updated RGB components are expressed as R =R(p)*O+R(p )*(1−O), G =G(p)*O+G(p )*(1−O), and B =B(p)*O+B(p )*(1−O) where O is the opacity value of image pixel p and p is the background pixel associated with the image pixel p.