The fundamental cause of the Yule – Nielsen effect, also called Optical Dot Gain, is the lateral scattering of light in paper. The lateral scatter of light can be described quantitatively by a point spread function, but a simpler model based on mean level scattering probabilities, P ij, for scattering of light from region i to region j, has been used to describe the Yule – Nielsen effect in terms of the sum of three, rather than two, reflectance factors. The three reflectance factors are (1) the reflectance of the ink, Ri, (2) the reflectance of the paper, R p, and (3) an apparent reflectance factor for a third component in the system, RCL. The nature and origin of the third component is modeled and shown to fit both tone and color behavior for an example halftone system.
Department, Program, or Center
Chester F. Carlson Center for Imaging Science (COS)
The Journal of Imaging Science and Technology 45N5 (2001) 466-471
RIT – Main Campus