The advantages of using two-color extended overprint ink

The biggest advantage is that it greatly expands the scope of the color gamut. Epson and several other inkjet printers and ink manufacturers are using a process similar to this six-color overprint to develop inkjet printers in hopes of achieving more realistic image colors. Inkjet printing has become a more popular digital replacement for film processors, and the use of lower-range inkjet printers can produce extraordinary results.

By adjusting the intensity and density of the colors used in printing, we can improve the appearance. The appearance effect is enhanced because the use of two colors reduces the contrast between colors. For example, when we have a very bright magenta and print the upper detail with a darker magenta, under bright magenta it may lose the darker point and enhance the image. This method of achieving the overall image effect by printing halftone dots in the details is clearly continuous in tone. POP display and other large designs used for close-up look can get better results from this method.

With the six-color process, not only can the image clarity and resolution be improved, but also the degree of overtone smoothness is better. Some of the more difficult to obtain colors such as flesh, grilled food, water, sky, chrome, and similar metallic colors can all be obtained by adding light tones in two-tone printing.

Duotone printing also reduces the appearance of textures in overprinting, which on the one hand reduces the halftone dot pattern and on the other expands the range of reproduced tones. With six-color printing, coarse halftones appear less coarse, 50 lines/inch halftone looks like 100 lines/inch, and 65 lines/inch looks like 120 lines/inch or better.

Printing using the duotones of cyan and magenta also extends the dynamic range of the copied image. The dynamic range is the difference between the brightest area and the darkest area. In short, it makes the darker tone darker and brighter.

Most prints have a maximum dynamic range of no less than 2.0. This standard is rarely met in screen printing and is generally between 1.6-1.8. A 2.0 dynamic range means that 1% of the bright dots can be restored, and the copied ink can absorb 99% of the light and reflect only 1% of the light (compared to the screen-printed black, which can only fall to 97.5%. -98.4%).

However, the dynamic range of the eyes of the human eye can reach 4.0 or more (1/10000 light perception, or 99.99% black perception). This is why dark details can be seen in the visual world and cannot be achieved in printing. With the two-tone color mode, we can increase the printed dynamic range to 2.2 (99.4% of black). This does not seem to be a big deal, but we can see that the black level obtained is better than the four-color overprint.

With two-tone printing, we have increased the highlights and shadows in the tonal range. In the past, our process often lost some of the layers when printing lighter, softer or darker colors. Duotones have a relatively long tone because of their soft appearance, good depth of detail, and dark details.

With the advantages of two-tone printing for high light color control, we have achieved better control over previously uncontrollable high neutral neutral colors such as beige, sand, ice, crystal reflections, detergents, tan, and more. These colors all have very few third color components. Duotone printing allows us to use larger dots in these color areas. This allows for greater control of the environment and physical variables, more accurate color reproduction, and shorter visible color range.

There is also a benefit in the darker part. By using darker colors than the normal primary colors magenta and cyan, we can better control the third color that needs to enhance the surface color of the dark tone region. Its main advantage is that we don't need to use too much black to compensate for the darkness. By using less black ink in the third color component, rich colors such as red brown, walnut, dark red, chestnut, dark green, indigo, and the like can be maintained. In the four-color mode, the additional black must completely cover the hue components of these colors, presenting a flat, black color.

Using two-tone can compensate for difficulties in copying brighter and darker colors, and the color drift phenomenon is also better controlled. Color drift refers to the color characteristics that change the appearance when the color tone becomes darker.

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