Since the advent of color inkjet printers, the type of ink has always been an important or even indicator of color performance. From four-color to six-color to eight-color printing, every time the number of colors increases, print images, especially digital photos Print quality has reached a new level. In the era of HP's eight-color printing, the colors directly obtained by digital photo printers have reached 72.9 million.
The substantial improvement of color photo printing quality has made home and commercial printer manufacturers such as HP more and more confident to promote digital photo printing to the professional field, and is no longer limited to the home market, especially in HP "eight color printing" professional digital photos After the launch of the HPPhotosmart7960 printer, Baise has become a favorite choice for professionals such as photographers and audiophiles. At this time, the "arbitrary" way of increasing the type of ink to improve print quality has also been more demanding from professionals.
Professionals believe that color is a three-dimensional color space, that is, the color gamut. If you increase the color of ink arbitrarily, it will not have a revolutionary impact on the color performance of printed digital photos. The trend towards increasing neutral colors is their recognized trend. Professionally, the color gamut is constructed from three independent and interacting parameters: hue, lightness, and saturation.
Hue is usually a saturated color that is sensitive to our vision, such as red, orange, yellow, green, cyan, blue, and purple. With the improvement of ink and printing technology, the output effect of color relative photo has been difficult to produce a breakthrough. Because the human eye can distinguish more than 150 hues in the spectrum, plus more than 30 extra-magenta colors, a total of about 180 kinds, the growth space is limited. If in addition to the existing magenta, cyan, and yellow, adding colors such as blue, green, and purple in the ink can only increase the hue saturation of the printed photo, it does not have much meaning for the increase in color gamut.
Therefore, the professional fields of photography, printing, publishing and others have invariably focused on the direction of improving lightness. That is to say, by adding neutral color inks, more changes in the light and dark levels of colors are exhibited, so that the "geometric level" "Number" to enhance color expression. HP digital photo printers have grown from six colors to eight colors. After adding two kinds of neutral inks, dark gray and light gray, the direct color types obtained from their digital photo printing surged from 1.2 million to 72.9 million. "Lightness" promotes the color gamut.
In the application of color photography, printing, packaging and other colors, the change of light and shade of colors occupies a very important position. Only the color or the change of the shades of the photos or patterns is dull, lacks three-dimensional sense, and is not vivid, thus losing its authenticity. Usually the natural color expression in inkjet printing technology is to increase the level of color change.
If you look at the scientific model of the color gamut, the vertical axis in the color space represents the change in the brightness of the black and white series. The upper end is white, the lower end is black, and the middle is a transition of various grays; the hue is represented by a circle on the plane. Each point represents a different hue in the visible spectrum. From the current standard, the origin of the hue is up to 180, and no more meaning. At this point, we can construct a color space. Each circle on the hue plane is projected onto the vertical axis of lightness, and we will get "points" representing different colors. The color parameters of each point indicate the brightness, hue and The specific data of the three saturations forms a three-dimensional color space. From the model, we can also see that the more neutral gray colors, the more changes in lightness, the finer the color space is cut, and the more color types, resulting in the color gamut being "geometric." "Expansion".
Based on the principle of color gamut, HP launched the Fuli Pro color layering technology to greatly improve the color performance of its eight-color ink printer. Accurate ink dot discharge, ultra-small ink droplets, intelligently distributed printing, etc., plus HP's unique halftone algorithm, enables the printer to obtain colors by stacking ink droplets according to the principle of color space. Among the HP eight-color inks, black, magenta, cyan, and yellow realize high-saturation hue printing, and light magenta, light cyan, and new dark gray and light gray are rich in lightness changes, so that the printing color The field reaches 72.9 million colors, suitable for printing from professional color images to black and white photos.
In terms of color gamut management, in order to expand the color space, HP eight-color ink digital photo printers have added support for AdobeRGB with a wider color gamut. Traditional printing is designed to match the color gamut of the sRGB display. The color gamut range is far smaller than the natural color gamut visible to the human eye, so the printed photos always cannot meet the strict requirements of professionals for color performance, and AdobeRGB is close to the human eye. Color gamut has become the color gamut standard for professional output peripherals such as printing, printing, digital printing, etc., and has been widely used.
Therefore, when talking about how to increase the color gamut by adding colors, professionals emphasized that "color gamut is not an addition and subtraction method for any type of ink." Only by increasing the type of neutral ink can the purpose of color gamut be truly achieved.
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