bstract. The use of color electrophotographic (EP) laser printing ystems is growing because of their declining cost. Thus, the print uality of color EP laser printers has become increasingly important. ince text and lines are indispensable to print quality, many studies ave proposed methods for measuring these print quality attributes. oner scatter caused by toner overdevelopment in color EP la...

Colour plays a vital role in marketing any product such as cosmetics, food additives, pharmaceutical products etc. It gives the attractiveness for product. also helps to get attention of customers. Early days synthetic dyes were used colorants these products. The carcinogenic effect and toxic made impact thirst on use natural dyes. Natural are obtained from pigments produced by microorganisms p...

In this article we compare two workflows for spectral color reproduction : colorant separation (CS) followed by halftoning by scalar error diffusion (SED) of its resulting multi-colorant channel image and a second workflow by spectral vector error diffusion (sVED). Identical filters are used in both SED and sVED to diffuse the error. Gamut mapping is performed as pre-processing and the reproduc...

Betacyanins and anthocyanins, two main red flower pigments, never occur together in the same plant. Although the anthocyanin biosynthetic pathway has been well analyzed, the biosynthetic genes and the regulatory mechanism of the betacyanin biosynthesis are still obscure. We cloned two cDNAs of DOPA dioxygenase from Phytolacca americana, PaDOD1 and PaDOD2, that may be involved in the betalain bi...

Betalains are a group of nitrogen-containing pigments that color plants in most families of Caryophyllales. Their biosynthesis has long been proposed to begin with hydroxylation of L-tyrosine to L-DOPA through monophenolase activity of tyrosinase, but biochemical evidence in vivo remains lacking. Here we report that a Group 4 catalase, catalase-phenol oxidase (named as AcCATPO), was identified,...

There is an interest in the development of an antioxidant packaging fully biodegradable to increase the shelf life of food products. An active film from cassava starch bio-based, incorporated with aqueous green tea extract and oil palm colorant was developed packaging. The effects of additives on the film properties were determined by measuring mechanical, barrier and thermal properties using a...

This paper describes a novel method for finding colorant amounts for which a printer will produce a requested color appearance based on constrained optimization. An error function defines the gamut mapping method and black replacement method. The constraints limit the feasible solution region to the device gamut and prevent exceeding the maximum total area coverage. Colorant values correspondin...