Predicting the colour of trichromatic prints by measuring the colour of the primaries and their areas resolution/speed defined in dots per inch (dpi), the shape and uniformity of dots, the amount of overlap, the solvent has been shown to be possible using large area textile prints. This approach has been extended to paper printing used and its drying time, and the nature of the substrate's surface (for paper there are several different types: matt, with much smaller coloured areas, in a predetermined array of squares. As before, the light reflected from the brilliant, polished, coated, etc.).
A wide gamut of colours can be obtained through an coloured areas mixed additively within the integrating sphere of a spectrophotometer. Cyan, magenta, and yel-ink-jet printer, using a matrix of dots to produce each pixel (the smallest picture element 3 Fig. 1), or by jetting low were used, with the addition of red, green, blue, and black, to simulate the typical situation likely to arise in coloured primary inks in such a way that they can mix on the substrate. It is also possible to apply the ink in commercial paper ink-jet printers. Partitive colour-mixing theory was used to predict the colours, and the results different densities by controlling the amount of ink used.
In a previous study, 4 it was established that ink-jet print-compared well with those obtained by measurement. However, unwanted overlaps of the printed coloured ing involves both partitive (additive) and subtractive mixing, due to the overlaps. For jet-printing technology the squares caused all the measured results to be darker and of higher chroma. The reverse process, whereby the area subtractive primary colours cyan, magenta, and yellow (CMY) are usually employed, together with black (K) for of each colour was calculated for a given target colour, specified by its tristimulus values, was also carried out.
dark colours. However, there has been a recent upsurge in interest in increasing the number of colours to seven or The results were generally in agreement with the actual number of squares used to produce the target, within one eight 5-7 in order to achieve a wider gamut.