First of all, let’s understand what dual-tone is. In fact, we can understand it from its literal meaning. “Double-color” refers to two colors, and “tone” refers to hue, that is, combining one The image is separated into dark parts, bright parts and mid-tones through grayscale, replacing the dark parts with one color, replacing the light parts with another color, and calling the transition color of these two colors in the middle. We use this picture to demonstrate that usually a normal color picture has three elements of color: hue, purity, and brightness. If it is processed into black and white or grayscale, it means that there is no hue and purity, just a pure expression of brightness, and the picture is divided into dark parts, bright parts and a transition zone in between. First, replace the dark part with a blue color, so the dark part in the picture becomes blue. Select a green color for the bright color part, and now a two-tone effect is achieved. The dark part of the picture becomes blue, the bright part becomes green, and the transitional gray part becomes a mixture of blue and green. If you reverse this, replacing the light parts with darker colors and the dark parts with lighter colors, you will get this negative-like effect. The difference between two-tone and two-color is in this "tone". This is not a word game, it is true, because there are only two colors in the two-color color picture, and two-tone color in addition to these two colors, there are also between them transition color. For example, the combination of green and red is undoubtedly a two-color combination. But if you also use green and red for a two-tone match, it would be green, red and the gradient between them. Take these two posters as an example. They use similar hues, but the one on the left is two-tone, and the one on the right is two-tone. The dark and bright parts of the poster on the left are filled with these two colors respectively, and the mid-tone part is them. transition colors between, while the poster on the right only has these two colors. Now that gradients are mentioned, I believe some people will have questions, what is the difference between dual-tone and gradient? Likewise, we still use pictures to speak. Here we use this picture to demonstrate the two effects of gradient and duotone. The first step is to process the image into black and white. The left side is a gradient from red to yellow-green from bottom to top, and the right side is a duotone effect using these two colors. Gradient is equivalent to placing a piece of colored glass on the picture. This piece of glass is a gradient from red to green. The effect seen through the glass only affects the color and does not change the details of the picture; while the one on the right The dual-tone effect is equivalent to changing the color of the picture, giving people an unreal feeling, because this is an effect we don't often see in reality. In fact, duotone is not a product of design. It existed as early as the late nineteenth century, using the duotone effect produced by cameras. Originally seen on sepia photos, it is also one of the most commonly used duotones. On the one hand, it can maintain the unmodified appearance of the industrial era, on the other hand, it can also give the photo an antique feel. This effect was later borrowed by the printing industry and became a cost-effective printing solution, because using duotone can be printed in batches at a lower cost and can also add an artistic effect to the image. In recent years, with the emergence of new media, the use of two-tone colors has gradually become popular and increasingly popular. The reason for popularity is no longer the problem of low printing costs, but more to do with the current aesthetics. The reason why dual-tone has become a new trend is that many people think that the music platform "Shengtian" brought this trend back to the mainstream. So when it comes to dual-tone, the first impression in most people's minds is this picture, but in fact This is only a two-tone color in a narrow sense, but a two-color color combination in a broad sense is not the only form of color matching. First of all, the first and most basic form is "black and white". Some people may ask, how can black and white be considered a two-tone color? Because here we are speaking in a broad sense, as long as the effect can be achieved through two-tone techniques, it can be regarded as two-tone, no matter what color it is. Black and white works can be achieved through duotone, but the filling colors are black and white. But one thing that needs to be reminded is that if you want to get a very high-quality black and white picture, this is also related to photography refinement and post-production color correction, rather than just two-tone. "Black and colored". This form is based on black and white, the dark part remains unchanged, and the light part is replaced with a colorful one. This effect can be achieved using gradient mapping or directly overlaying color blocks.
We use this picture to demonstrate. The method is to add a color block to the picture, fill it with green, and select Multiply as the layer mode. It can also be achieved through gradient mapping. The effect achieved is a combination of black and color. Finally With text. "White and colored". That is, the dark parts are filled with a color, and the light parts remain unchanged. Because white is dominant, this effect usually has a sense of lightness and simplicity. It is also traditionally called monochrome mode, but here we have classified it into the category of two-tone mode. Let’s still use this picture to demonstrate. We also overlay color blocks, but choose Screen Color as the layer mode. Of course, it can also be achieved through gradient mapping. Although there is a slight difference in the effects obtained by the two methods, it can be ignored. "There is color and its different shades." In this form, the dark and light parts are replaced with the same hue, but the relationship between light and dark is expressed through hue. "Colorful and colorful combinations." This is also our usual basic impression of two-tone colors, and it is also the two-tone color in the narrow sense we mentioned earlier. This kind of two-color form with color and color is difficult to achieve by superimposing color blocks, and gradient mapping is the first choice. Here we have used this image to create three different two-tone color combinations. This series of posters is the visual image of a hundred-person choir. The creative use of classic paintings to depict the theme of the concert. In the renderings, the background is the original painting, and the poster is placed on top of the original painting to intercept the layout, using different colors. The color combination has been treated with two-tone processing. Although each one has a different hue, because they are all two-tone expressions, the whole looks like a whole. The visual image of this brand also uses a two-tone combination of color and color. The combination of blue and pink gives people a young and fashionable feeling.