公开(公告)号：EP3742716A1

公开(公告)日：2020-11-25

申请号：EP19176488.5

申请日：2019-05-24

申请人： Canon Production Printing Holding B.V.

发明人： LUTTMER, Maurice L. M.

IPC分类号： H04N1/60

摘要： A method for calibrating and converting colours 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 colour values in a profile connecting colour 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 colour value is to be converted either by using the profiles or by using the one-dimensional relation; converting the image colour value and subsequently using the printer calibration relations to obtain the colorant control values. This procedure enables the use of G7 colours in a printer that is limited in its amount of colorant that can be applied locally.