Patent ID: 11170275

Abstract:
A method for calibrating and converting colors of a digital image into printer specific colorant control values is disclosed. This method comprises the steps of calibrating a specific printer of a printer type according to a printer type specific procedure, wherein for each colorant separately a one-dimensional relationship between a printer tone value and a colorant control value is established; profiling the printer type to establish an output profile that defines a relationship between color values in a profile connecting color space and the printer tone values; deriving from the input profile and the output profile a one-dimensional relationship between a black channel and the black printer tone value of the printer; determining if an image color value is to be converted either by using the profiles or by using the one-dimensional relation; converting the image color value and subsequently using the printer calibration relations to obtain the colorant control values. This procedure enables the use of G7 colors in a printer that is limited in its amount of colorant that can be applied locally.