Inkjet printing system for textile using hi-fi Colors

We have developed a textile inkjet printing system having a large gamut and smooth gradations. In textile printing, some particular colors are more important than the others. We use orange, red and violet hi-fi color inks in addition to conventional cyan, magenta, yellow and black in order to fulfill the request. These colors are processed based on the minimum hi-fi method and the maximum black method. The printer can reproduce large color gamut in red and blue regions with a high precision of average DeltaE(ab)(*)=2.05. In order to ensure smooth gradations, we have developed a new smoothing technique and a new interpolation technique for color transformation. The both convert tonal curve to be linear scale in the processing. As a result, the printer can produce smooth gradations throughout the entire color gamut composed by CMYK and hi-fi colors.