| 20120099157 | METHOD FOR MAKING OVERPRINT PREDICTIONS - To improve a method for making an overprint prediction to that extent, that the method allows more reliable overprint predictions with a reduced effort, the invention proposes a method for making the overprint prediction for a color combination, in which method a printing substrate and at least two printing colors and one gradation of hue values per printing color including the full tone as well as color combinations are predefined as data of the hue value of the n printing colors, wherein first of all individual color predictions comprising three transmittance components and the associated transmittance spectra for the respective hue value are determined for each of the n printing colors, wherein for an intended color combination up to (3 to the power of n) combinations of the transmittance components and the associated combined transmittance spectra are determined, and an overall reflectance spectrum of an overprint is predicted on the basis of the determined transmittance components with their transmittance spectra and the reflectance spectrum of the unprinted substrate. | 04-26-2012 |
| 20100277499 | Method for Transformation of Colour Values - In order to provide a method for transformation of an initial colour space to a target colour space in which, in particular, detail losses and contrast losses are minimized, the present invention proposes a method for transformation of colour values from a an initial colour space to a target colour space, both of which are related to a defined basic colour space, in which case at least one plane in the colour spaces define a profile of the brightness from bright to dark, and planes running transversely thereto define colour variations, characterized by the following steps a) movement from the initial colour space and/or the target colour space by conversion of all the colour values of one of the two colour spaces to different colour values in the basic colour space, so that the initial and the target colour space are coincident with respect to at least one colour value located at the edge of a colour space, b) scaling of the initial colour space and/or target colour space by conversion of all the colour values of one of the two colour spaces to different colour values in the basic colour space, such that the initial and the target colour space are coincident with respect to at least one plane which is defined by the edge colour value, which has been made to coincide, and an essentially opposite edge colour value, c) conversion of each colour value of the initial colour space which is outside the target colour space to a colour value which is closest to this colour value in the edge area of the target colour space, d) movement of the colour values which are located in a defined edge area of the target colour space to the interior of the target colour space by conversion as a function of the number of identical edge colour values in each case to colour values essentially on the same colour variation plane, until a predetermined number of identical edge colour values are achieved on the respective colour variation plane. | 11-04-2010 |
