Hewlett-packard Development Company, L.p.

Other

Hewlett-packard Company

Shilin Guo

Vladek P Kasperchik

Eric Lee Burch

David Herbert Donovan

Guo Li

Dan M Weeks

David J Arcaro

Gary E Hanson

Richard J Mcmanus

Dale Dean Timm, Jr

Maximo Gayoso

David Luis Pereira

John A Dangelawicz

Behnam Baslani

J Grady Jurrens

Rob Patrick Chohan

Julie Huynh

A printer is disclosed in one example. The printer controls the amounts of the inks that are used when printing. The printer prints colors near saturation onto a media using mostly a first ink and prints saturated colors onto the media using mostly a second ink. The second ink has a reduced loading of the colorant in the first ink.

Printing near saturation

A method for double-sided printing may include ejecting printing fluid from a fluid ejector to a platen configured to receive print media, the platen supporting a nonabsorbent substrate. In any sequence, a first print media side and a second print media side may be printed by ejecting printing fluid from the fluid ejector to the first print media side, and contacting the second print media side with the nonabsorbent substrate to transfer printing fluid from the nonabsorbent substrate to the second print media side. A method for double-side printing may further include increasing the contact between the second print media side with the nonabsorbent substrate to increase transfer of printing fluid.

Double-sided printing system

Preferably, test-patterns print on separate, multiple print-medium cards, each including a ramp with colors graded along a certain direction&#x2014;and, superimposed on the ramp, a candidate add-on colorant. Ramps preferably are printed in so-called 'customer colors', common in snapshots and particularly snapshot regions that include sky. Positions or amounts of the candidate add-on colorant canvass a likely range of values that optimize camouflaging or suppression of a banding artifact (due to seams in the pagewide array) that is extended along the same certain direction. For each seam and each 'customer color' used, an operator holds up several cards for comparison, selecting the best one to three. Operators thus can evaluate candidate colorant patterns in context of many different tones of the sky and other customer colors. Preferably banding suppression is integrated with linearization: at each seam a series of linearization tables is smoothly interpolated between measurement-based tables for adjacent inkjet dice.

Interactive visual card-selection process for mitigating light-area banding in a pagewide array

The present invention is drawn to the thermal transfer overcoating of images printed on porous media, and methods of overcoating images printed on porous media. Upon use of the systems and methods of the present invention, a thermally coated print is generated that can comprise a porous media substrate having printed thereon a digitally produced image. The digitally produced image and the porous media substrate is thermally coated by an adhesive protective layer, wherein the adhesive protective layer has a tangent d that is greater than 1 and melt viscosity less than 1&#xd7;10Pa.&#xb7;sec. as applied above its phase transition temperature. Thus, the voids in the porous media substrate can be substantially filled, and further, substantially no tags remain on the print.

Images printed on porous media and coated with a thermal transfer overcoat

A system and method for drying a printed medium includes a heated roll and a transport mechanism which moves the printed medium against the heated roll to dry the printed medium.

Heated roll system for drying printed media

Disclosed is a new printing apparatus and process for inkjet printers which incorporates spectral modeling of ink mixing and the technology of halftoning in device-independent color space. In addition no colormap building or color mapping processing is necessary, because color correction is conducted in device-independent space and is built into the halftoning process. also disclosed is an automatic self-calibration by the printer without user intervention or user preferences by using an optical sensing unit on the printer. The procedure corrects for print cartridge to print cartridge variance, and variance of print cartridges over time and also provides for faster processing of color images.

Application of spectral modeling theory in device-independent color

Growing community of inventors

San Diego, CA, United States of America

Shilin Guo