Patent ID: 6644799
Filing Date: 2003-11-11
Classification: B41M,C09D

Abstract:
A method of selecting pigment ink set and a receiver combination for inkjet color printing comprising:f) providing at least two color inks, each ink comprising a carrier and a pigment; g) printing the above inks onto a set of receivers using test images consisting of single color patches of a Dmax density (100% dot coverage); h) measuring the gloss level of each patch and the receiver at a predefined specular angle; i) calculating the Relative Gloss Difference (RGD%) values of the ink set and receiver combination; and j) selecting the ink set and receiver combination such that RGD value is less than 40% when 60Â° is used as the specular angle, and the RGD value is calculated according to Equations (A): RGD&it;â€ƒ&it;%=&Sum;I=1N&it;â€ƒ&it;&LeftBracketingBar;Gloss&it;â€ƒ&it;(Imaged&it;â€ƒ&it;Areas)I-Gloss&it;â€ƒ&it;(Non&it;-&it;Imaged&it;â€ƒ&it;Areas)&RightBracketingBar;&Sum;I=1N&it;â€ƒ&it;Gloss&it;â€ƒ&it;(Imaged&it;â€ƒ&it;Areas)IEquation&it;â€ƒ&it;(A)â€ƒwhere I is a variable which identifies a certain color patch used in the evaluation, N is the total number of color patches used in the evaluation.