What is disyllabic and how to use it comprehensively?

First, let's look at what disyllabic is. In fact, it can be understood literally. "Bi-tone" refers to two colors, and "tone" refers to tone, that is, an image is divided into dark parts, bright parts and intermediate tones by gray level, and the dark parts are replaced by one color, and the bright parts are replaced by another color, and the transition colors of these two colors are called in the middle to replace them. We use this picture to prove that a normal color picture usually has color elements: hue, purity and brightness. If it is processed into black and white or gray, it means that there is no hue and purity, but only pure brightness. The picture is divided into dark parts, bright parts and intermediate transition areas. Replace the dark part first and choose a blue one, so that the dark part in the picture becomes blue. Choose green for the bright part, and now it has achieved a two-color effect. In the picture, the dark part turns blue, the bright part turns green, and the gray part in the middle turns blue and green. On the other hand, if the bright part is changed into a darker color and the dark part is changed into a brighter color, this similar negative effect will appear. The difference between two-color harmony and two-color harmony lies in this "tone". We are not playing word games here, indeed, because there are only two colors in the bichromatic map, besides these two colors, there are transition colors between them. For example, the combination of green and red is undoubtedly two colors. But if green and red are also used in two-color collocation, it is green, red and the gradient between them. Take these two posters as an example. They use similar tones, but the one on the left is two-colored, and the one on the right is two-colored. The dark and bright parts of the poster on the left are filled with these two colors, and the middle part is the transition color between them, while the poster on the right has only these two colors. Since the gradient is mentioned, I believe some people will have questions. What's the difference between two-color harmony and gradient? Similarly, we still use pictures to talk. Here we use this picture to demonstrate the gradient and two-color effect respectively. The first step is to process the picture into black and white, with a gradient from red to yellow-green on the left and a two-color effect using these two colors on the right. Gradient is equivalent to putting a piece of colored glass on the screen, which is a gradient from red to green. The effect of looking through the glass only affects the color and does not change the details of the picture. The two-color effect on the right 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, bicolor is not a product of design, but existed as early as the end of the 19th century, that is, the bicolor effect produced by cameras. It first appeared in sepia photos and is one of the two most commonly used tones. On the one hand, it can keep the simplicity of the industrial age, on the other hand, it can make the photos look antique. Later, this effect was used for reference by the printing industry and became an economical and effective printing scheme, because the use of two colors can be used for batch printing at a lower cost and can also add artistic effects to images. In recent years, with the emergence of new media, the use of two colors has gradually become popular and more and more popular. The reason for its popularity is not the low printing cost, but more related to the current aesthetics. Many people think that the music platform "sound field" has brought this trend back to the mainstream, so when it comes to two tones, the first impression in most people's minds is this picture, but it is actually only a narrow sense of two tones, and a broad sense of two tones is not the only form of color matching. First, the first and most basic form is "black and white". Some people may say, how can black and white be considered as two tones? Because here we are speaking in a broad sense, as long as the effect can be achieved through the two-color method, it can be regarded as two colors, no matter what color. Black-and-white works can be realized in two tones, but the filling color is black and white. However, one thing to be reminded is that if you want to get a very textured black and white picture, it is also related to fine photography and post-toning, not just two tones. Black and color. On the basis of black and white, the dark part is unchanged and the bright part is changed to color. This effect can be achieved by gradient mapping or direct superposition of color blocks. We use this picture to demonstrate that the method is to add a color block to the picture, fill it with green, choose positive superposition as the layer mode, or realize it through gradient mapping. The effect achieved is all black with color, and finally matches the text. White and color. That is, the dark part is filled with color, and the bright part remains unchanged. This effect is mainly white, so there is usually a feeling of lightness and simplicity. Traditionally, it is also called monochrome mode, but here we all fall into the category of two colors. We use this picture to demonstrate that the color blocks are also superimposed, but the layer mode should be color filtering, and of course it can also be realized by gradient mapping. Although the two methods are slightly different, the results can be ignored. There are colors and their different shades. In this form, the dark part and the bright part are replaced by the same hue, but the relationship between light and shade is expressed by hue. "Color, color matching". This is also our basic impression of disyllables at ordinary times, and it is also the narrow disyllables we mentioned earlier. This kind of colored two-color form is difficult to realize by overlapping color blocks, and gradient mapping is the first choice. Here we use this picture to make three different sets of two-color mixed colors. This series of posters is the visual image of a 100 chorus. The creative production of the poster uses classic paintings to describe the theme of the concert. In the rendering, the background is the original painting, and the poster is cut and typeset on the original painting, and different color matching treatments are made. Although each has a different hue, it looks like a whole, because they are all two-color expressions. The visual image of this brand also adopts the two-color collocation of color and color, and the collocation of blue and pink gives people a feeling of youth and fashion.