Folding Paper Boxes For AKBAR Tea The gamut is not an addition or subtraction of any ink type

Folding Paper Boxes For AKBAR Tea The gamut is not an addition or subtraction of any ink type

After the appearance of color inkjet printers, ink types have always been an important or even the only indicator to measure the performance of color, from four colors, six colors to the current eight-color printing, each time the increase in color types, printed images, especially digital photos, the print quality has reached a new level. By the HP 8-color printing era, the color directly obtained by digital photo printers has reached 72.9 million.

The significant improvement in the quality of color photo printing has made HP and other home and commercial printer manufacturers more and more confident in the promotion of digital photo printing to the professional field, no longer limited to the home market, especially after the HP "eight color printing" professional digital photo printer HPPhotosmart7960 came out. Eight colors have become a favorite choice for photographers, enthusiasts and other professionals. At this time, the way to "arbitrarily" increase the type of ink to improve the print quality has also been more stringent requirements from professionals.

Professional believe that color is a three-dimensional color space, that is, the color gamut, if you arbitrarily increase the color types of ink, and can not have a revolutionary impact on the color performance of printed digital photos. Moving in the direction of increasing neutral colors is a trend they recognize. Technically, the gamut is constructed by three independent and interacting parameters: hue, lightness, and saturation.

Hue is usually our visual sensitive saturated colors, such as red, orange, yellow, green, cyan, blue and purple, with the improvement of ink and printing technology, hue has been difficult to have a breakthrough impact on photo output. Because the human eye can distinguish more than 150 kinds of colors in the spectrum at most, plus more than 30 kinds of magenta outside the spectrum, a total of about 180 kinds, the growth space is limited. If in addition to the existing magenta, cyan and yellow, increasing the ink such as blue, green, purple and other colors, can only improve the color saturation of the printed photo, the increase in color gamut does not have much significance.

Therefore, photography, printing, publishing and other professional fields, coincidentally focused on the direction of improving the brightness, that is, by increasing the neutral ink, showing more changes in the level of color light and dark, so as to "geometric progression" to improve the color expression. HP digital photo printers grew from six colors to eight colors, and after adding two neutral inks, dark gray and light gray, the direct color types obtained by digital photo printing surged from 1.2 million to 72.9 million, which shows the promotion of "brightness" to improve the color gamut.

In the application of color photography, printing, packaging and other colors, the change of light and shade of color occupies a very key position, and the photo or pattern only has color and no change in depth, it is stiff, lack of three-dimensional sense, not vivid, and thus lose the authenticity. Usually, the natural color performance of 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 of the color space represents the change of the brightness of the black and white series, the upper end is white, the lower end is black, and the middle is various gray transitions; Hue is represented by a horizontal circle, and each point on the circle represents a variety of different hues in the visible spectrum, from the current standard, the origin of the hue reaches a maximum of 180, and more is meaningless. At this time, we can construct a color space, hue on the plane of each circle, projected to the vertical axis of brightness, will get a different color performance of the "point", each point of the color parameters marked the brightness, hue and saturation of the three specific data, so as to form a three-dimensional color space. From the model, we can also see that the more neutral gray color, the more changes in brightness, the finer the color space is cut, the more color types, and ultimately lead to a "geometric" expansion of the color gamut.

Based on the principle of color gamut, HP introduced the Fulitu Pro color layering technology to greatly improve the color performance of its eight-color ink printers. Precise ink spot discharge, ultra-small ink droplets, intelligent distribution of printing, and HP's unique half-tone algorithm enable the printer to obtain color by layering ink droplets according to the principle of color space. HP eight color inks, black, magenta, cyan, yellow, achieve high saturation color printing, light magenta, light cyan plus new dark gray and light gray get rich brightness changes, so that the printing color gamut reaches 72.9 million colors, suitable for professional color images to black and white photo printing.

In order to expand the color space, HP 8-color ink digital photo printers have added support for AdobeRGB with a wider color gamut. Traditional printing is designed to match the sRGB display gamut, the gamut range is far less than the natural gamut visible to the human eye, so the printed photos always can not meet the strict requirements of professionals on color performance, and AdobeRGB to close to the human eye gamut, printing, digital printing and other professional output peripheral equipment color gamut standard, has been widely used.

Therefore, when talking about how to expand the gamut by adding color, professionals emphasize that "gamut is not the addition and subtraction of any ink type," and improving the type of neutral ink can really achieve the purpose of expanding the gamut.