Color gamut is not an addition or subtraction of any ink type
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After the advent of color inkjet printers, the ink type has always been an important and even the only indicator to measure the performance of color performance. From four colors, six colors to the current eight-color printing, each color type increases, print images, especially digital photos. Print quality has reached a new level. In the era of HP's eight-color printing, digital photo printers have directly received 72.9 million colors.
The quality of color photo printing has been greatly improved, making HP and other domestic and commercial printer manufacturers more and more confident to promote digital photo printing to the professional field, no longer limited to the home market, especially in HP "eight color printing" professional digital photos. After the introduction of the printer HP Photosmart 7960, eight colors became a favorite choice for photographers, enthusiasts and other professionals. At this time, the way to increase the ink quality "any" to improve the print quality has also received more stringent requirements from professionals.
Professionals believe that color is a three-dimensional color space, which is the color gamut. If you increase the color of ink, you can't revolutionize the color performance of digital photos. It is the trend they recognize to move toward the direction of increasing neutrality. Professionally, the color gamut is constructed from three separate and interacting parameters: hue, lightness, and saturation.
Hue is usually our visually sensitive saturated colors, such as red, orange, yellow, green, cyan, blue, and purple. With the advancement of ink and printing technology, color is relatively difficult to produce a breakthrough effect on photo output. Because the human eye can distinguish more than 150 kinds of hue in the spectrum, plus more than 30 kinds of magenta in the spectrum, a total of about 180 kinds, the growth space is limited. If you add colors such as blue, green, and purple in the inks other than the existing magenta, cyan, and yellow, you can only increase the hue saturation of the printed photos, and the increase in color gamut does not make much sense.
Therefore, the professional fields of photography, printing, publishing, etc., have invariably focused on the direction of improving brightness, that is, by adding neutral inks, they show more changes in color and darkness, thus The number "expresses 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 number of direct colors printed by digital photos has increased 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 light and dark changes of color occupy a very important position. The photos or patterns have only color and no change in depth, which is dull, lacking in three-dimensional sense, not vivid, and thus losing authenticity. The natural color expression usually mentioned in inkjet printing technology is to increase the level of color shading.
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 the transitional gray; the hue is represented by a circle with a water plane, on the circle Each point represents a variety of different hue in the visible spectrum. From the current standard, the origin in the hue is up to 180, and no more meaning. At this point, we can construct the color space. Each circle on the plane of the hue, projected onto the vertical axis of the brightness, will get the "points" that represent different colors. The color parameters of each point indicate the brightness, hue and The specific data of the three saturations, thus forming a three-dimensional color space. From the model we can also see that the more the neutral gray color, the more the brightness changes, the finer the color space is cut, the more the color types, and finally the color gamut is "geometric." The number "expanded.
Based on the principle of color gamut, HP introduced the Fulfill Pro color layering technology to greatly improve the color performance of its eight-color ink printer. Precise dot discharge, ultra-small ink droplets, intelligent distribution printing, and HP's unique halftone algorithm enable printers to color by stacking ink droplets according to the principle of color space. In HP eight-color ink, black, magenta, cyan, and yellow achieve high-saturation hue printing. Light magenta, light cyan, and new dark gray and light gray give rich brightness changes, thus making print colors. The field reaches 72.9 million colors and is suitable for printing from professional color images to black and white photos.
In color gamut management, in order to expand the color space, HP eight-color ink digital photo printer has increased support for wider color gamut AdobeRGB. Traditional printing is designed to match the sRGB display color gamut. The color gamut range is much smaller than the natural color gamut visible to the human eye, so the printed photos are always unable to meet the strict requirements of professionals for color performance, and AdobeRGB is close to the human eye. The color gamut has become the color gamut standard for professional output peripherals such as printing, printing, and digital printing, and has been widely used.
Therefore, when talking about how to increase the color gamut by expanding the color, the professional emphasizes that "the color gamut is not the addition and subtraction of any ink type", and the type of neutral ink can be upgraded to truly expand the color gamut.