Verfahren zur Kalibrierung und Umwandlung von Cmyk-Farben

Details

Veröffentlichungs-Nr.

EP3742716

Aktenzeichen

EP19176488

Anmeldetag

24. Mai 2019

Veröffentlichung

21. Dezember 2022

Erteilung

21. Dezember 2022

Rechtsraum

EP

IPC

H04N1/60

Abstract

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.

Anmelder

Firma

Canon Production Printing Holding B.V.

Land

🇳🇱 Niederlande

Fachgebiete