Stable Gray Line Under Color Removal/Gray Color Removal (UCR/GCR) For Unstable Printers
Publication Date: 2003-Sep-18
The IP.com Prior Art Database
Rich composite blacks provide a wonderfully large color gamut. However rich composite blacks need to be very finely tuned near the gray line otherwise the gray line will not appear to be gray (a neutral color). For this reason it is difficult to keep the gray line perceptually gray on an unstable printer. Process black is very hue stable. Using heavy concentrations of process black along the gray line improves color stability. By creating a UCR/GCR scheme that uses rich composite blacks near the gamut surfaces, and heavy concentrations of process black near the gray line it is possible to reap the benefits of both worlds.