Method for the subtractive colour mixing representation of a television picture displayed on the screen of a monitor by additive colour mixing

摘要

The invention relates to a method for printing out in colour a television picture, displayed on the screen of a monitor by additive colour mixing of the colours red, green and blue, by subtractive colour mixing of the primary colours yellow, magenta and cyan, if necessary with further colours, by means of a multicolour dot sequence printer having memories in which the associated print data to be printed out in the primary colours and further colours are stored for controlling the multicolour printing device. The printout is made on a white print carrier. For conversion the colour signal components are digitised and are divided into defined stages by value. In this process, several picture elements are combined whenever the individual colours cannot be measured in relation to colour to one picture element in terms of their quantity. The print colours are determined in a known manner by adding in each case two colour components of the television picture colours, red + green forming the primary colour yellow, red + blue forming the primary colour magenta, and green + blue forming the primary colour cyan and corresponding in value to the colour components. The colour saturation of the individual primary colours, in relation to a dot to be printed, is calculated from the sum ratios of the graded colour components of the RGB colours measured by value, the largest sum forming the largest colour component, the medium sum forming the medium colour component and the smallest sum forming the smallest colour component. The colour components by value of the primary colours to be printed out are calculates by subtracting the minimum, medium and maximum colour components of the RGB television picture colours and are read into a memory, which is read out by the printer controller, the data then controlling the multicolour printing device.