Patent ID: 7054031

Claim:
A method of making separations for color printing using two overprinted transparent inks which comprises: providing a red, green, blue (RGB) encoded initial image; convening the RGB encoded image to a cyan, magenta, yellow (CMY) encoded image; preparing cyan, magenta, and yellow image separations as source images; determining visually selected dominant object colors of the original image; choosing from a color palette two transparent ink spot colors which best represent the selected dominant object colors; selecting two channels from the cyan, magenta, and yellow source images as first and second channels and assigning a selected transparent spot color to each channel; superimposing the first and second channels now rendered with the selected spot colors to form a composite image; adjusting greyscale values of the two superimposed spot color channels to visually produce an image most closely resembling the desired final image; and making new separations of the two channels suitable for preparing printing plates.