Talk about the many color modes of Photoshop (two)
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RGB, CMYK, LAB, HSB... Maybe many of my friends have seen these color modes, but do you know them? Most of my friends will say no. Color mode is the most basic knowledge of graphic design. How can I not master it? Each mode has its own advantages and disadvantages, and has its own scope of application. Let me talk to you about these color modes in detail.
4, HSB mode
After introducing the three main color modes, we now introduce another color mode, the HSB color mode, which appears in the color capture window.
In HSB mode, H represents hue, S represents saturation, and B represents brightness.
Hue: It is a solid color, which is a single color that makes up the visible spectrum. Red is at 0 degrees, green at 120 degrees, and blue at 240 degrees. It is basically a pie chart of RGB mode full color.
Saturation: Indicates the purity of the color. When it is 0, it is a color. White, black and other gray colors are not saturated. At maximum saturation, each hue has the purest shades of light.
Brightness: It is a bright read of color. When it is 0, it is black. The maximum brightness is the most vivid state of color.
5, Indexed mode
The Indexed mode is the index color mode, also called the mapped color. In this mode, only one 8-bit color depth file can be stored, ie up to 256 colors, and the colors are pre-defined. All colors of an image are defined in its image file, that is, all colors are mapped to a color palette. This is called a color comparison table. Therefore, when the image file is opened, the color comparison table is also read into Photoshop, and Photoshop finds the final color value from the color comparison table.
6, GrauScale mode
After introducing the beautiful color world, I am now entering the gray world. In fact, gray is also a kind of color, but also has a beautiful side.
A grayscale file is an 8-bit image that can be composed of up to 256 shades of gray, and brightness is the only element that controls grayscale. The brightness is about high, the lighter the gray, the closer to white; the darker the bottom, the darker the gray, the closer it is to black. Therefore, black and white are included in the grayscale, which are a subset of the grayscale mode.
Only grayscale exists in grayscale mode. When a color file is converted to a grayscale file, all color information is removed from the file. Although Photoshop allows you to convert a grayscale file to a color mode file, it is impossible to restore the original color to its original shape.
In a grayscale file, the color saturation of the image is zero, and brightness is the only option that can affect the grayscale image. Brightness is a measure of light intensity, with 0% representing black and 100% representing white. The K value in the Color palette is used to measure the amount of black ink.
7, Bitmap mode
The black and white bitmap mode is an image consisting of only black and white pixels. Some people think that black is a subset of the grayscale color mode, so this mode is not very useful. In fact, this is a misunderstanding. Just because of the Bitmap mode, you can better control the printout of grayscale images. In fact, output devices such as laser printers use small dots to render grayscale images. Therefore, using Bitmap mode, you can better set the size and shape of the dots.
It should be noted that only grayscale images or multi-channel images can be converted to Bitmap mode. A dialog box will appear, and you can set the output resolution and conversion mode of the file here. The specific setting method is as follows:
Output: Refers to the resolution of a black and white image.
Method: Provide the following 5 settings.
50%Threshold: When selected, more than 50% of grayscale pixels will turn black, while less than or equal to 50% of grayscale images will turn white.
Pattern Dither: Uses random black and white pixels to dither the image. Images generated using this method are ugly, and there is almost no gap between pixels.
Diffusion Dither: Use this to create a metallic effect. It uses a divergent process to change a pixel to a single color, which results in a grain effect.
Halftone Screen: This conversion makes the image look like a grayscale image printed on a half-color screen.
Custom Pattern: This conversion method allows a custom pattern (the pattern defined by the Custom Pattern command in the Edit menu) to be added to a bitmap image.
Please note that when the image is converted to Bitmap mode, no other edits can be made, and even images in grayscale mode cannot be restored.
8, Duotone two-color set mode
Duotone mode uses a grayscale ink or color ink to render a grayscale image for two-color overprinting or same-color shading. In this mode, up to four colors can be added to the grayscale image, so that an image that is much better than the simple grayscale mode can be printed.